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Featuring Demian Dressler, DVM and Susan Ettinger, DVM, Dip. ACVIM (Oncology), authors of The Dog Cancer Survival Guide

Breast Cancer Signs in Dogs: What to Look For and How to Think About Mammary Cancer

Updated: January 16th, 2019


Breast cancer dogs — what are the signs and symptoms? And what do we do about them when we find them? Dr. Dressler explains.

Breast cancer … dogs? Can dogs even get breast cancer? Yes, they do.  We don’t call it by the same name; in dogs, we call it mammary cancer, but the mammary gland is the bulk of the body part and the disease is very similar.

Thankfully, breast cancer in dogs is not as aggressive as breast cancer usually is in humans … but it’s serious, nonetheless. For a full discussion of breast cancer, including its warning signs, treatment, and special diet considerations, please see chapter 31, which starts on page 320 of The Dog Cancer Survival Guide.

Signs of Breast Cancer in Dogs

Signs of breast cancer in dogs include the following:

  • small nodules within the mammary tissue (they feel like little BBs)
  • larger nodules within the mammary tissue, but still under the skin
  • bloody discharge from the nipple
  • straw-colored discharge from the nipple
  • pus-like discharge from the nipple
  • larger, deeper growths in the mammary tissue that protrude visibly and can be seen as lumps

Want to learn more on mammary tumors? Get the Dog Cancer Survival Guide, and flip to Chapter 31

Spaying and Breast Cancer

Veterinarians often advocate early spay on females (before 6 months) because it can prevent breast cancer later on. And it’s true: female dogs who have been surgically sterilized before their first heat, which is usually around 6 months of age, are essentially free of breast (mammary) cancer. As the spay age increases, this protection drops.

(It should be noted that early spay and neuter is associated with increased risks of other types of cancer however, such as osteosarcoma and transitional cell carcinoma).

It is still debated as to whether spaying once mammary cancer has developed in dogs actually help the problem, and the evidence over the last couple of decades is mixed at this time.

Found a Lump on Your Dog’s Breast? Get It Checked.

The most critical thing to remember is that if you have a female dog who has a bump in the area around the teat (nipple), please get it checked.

Many of these growths are life-threatening.  And if you have a female dog who is not spayed (intact), or was spayed later in life (at more than 6 months of age), examination of the mammary tissue of your dog may be a lifesaver.

How To Give Your Dog a Home Breast Exam

Breast exam in dogs? Yes, you heard it here first.  You should absolutely examine your dog, especially if she is intact or was spayed late.

How do you do it?

Many dogs like to lay on their sides or back.  If your dog “gives belly,” you can do her exam then … but even dogs who won’t roll over can be examined. Whether giving belly or standing up, here’s what you do.

First, find the mammary glands. Dogs normally have ten, two rows of 5 going down the length of the body, one on the left and one on the right. If your dog has an extra teat or a missing teat, or if they are not perfectly aligned from left to right, don’t worry. Variations are normal!

What’s not normal is a lump like what’s described above. So use your fingers to “see” as well as feel, as instructed below. There are two separate techniques to use — so don’t skip these steps.

  • To make sure your dog is comfortable, try doing this with two hands, one on the left chain and the other on the right chain.
  • Keep your fingers flat and use the pads of your fingertips to “fan” through the mammary tissue up and down the torso, from the head to tail. Start on the first teat on both sides and work down toward the last teat on both sides, feeling for “blips” or bumps under your fingertips.
  • Still keeping your fingers flat, fan your fingers left to right, from the first set of teats to the last. You are still looking for those little blips or bumps.
  • Next, use the second technique, which is to gently press the mammary tissue to look for deeper bumps or lumps. On each teat, gently gather the mammary tissue between your thumb on one side and your index and middle finger on the other. Keep in mind that this could be sensitive for your pup! Gently roll the tissue with your thumb as your fingers hold the other side. Move your thumb in a circular motion and feel for blips and bumps between your fingers.
  • Any area that is hard or different is worth having a veterinarian take a look at.
  • If you can see pus, blood, or any other abnormality on the mammary tissue, definitely get it looked at.

How often to do an examination like this on your dog?  I would suggest every month or so for female dogs above the age of 7 years.

Even if your dog had an early spay, do a breast exam every once in a while for your piece of mind. It’s well worth the few minutes.

Treating Breast Cancer in Dogs

Breast cancer in dogs is best treated with a combination of different Full Spectrum steps.  In my patients, I use surgery, dietary changes, Apocaps, deliberate efforts to increase life quality, reduction in body fat (a risk factor for mammary cancer), immune boosting and other supplements, touch therapies, and more.  This cancer does not respond very well to chemotherapy as a rule.


Dr D


Discover the Full Spectrum Approach to Dog Cancer

Leave a Comment

  1. Sandi Davis on February 16, 2019 at 11:58 am

    If it is cancer does the area become hot and red and does it cause them to have a hard time breathing

  2. Sarah Drysdale on February 2, 2019 at 11:43 am

    My Greyhound has started to n6

  3. Nicole on January 16, 2019 at 8:55 pm

    Can you send me a picture of what the discharge from the nipple would look like as far as the puss or the straw color because my dog is lactating and I’m not sure the color difference from that and milk

    • Dog Cancer Vet Team on January 17, 2019 at 7:53 am

      Hello Nicole,

      Thanks for writing! We here at customer support cannot offer you medical advice, because we’re not veterinarians. For something like this, you will have to consult with your vet. They know your dog, and her health situation, and will be able to help you figure out the color difference.

      You could ask the members in the Dog Cancer Support Group on Facebook if they have any information/pictures/experience with regards to your question 🙂 Even though the Dog Cancer Support Group is for the Dog Cancer Survival Guide readers only, the admins will accept your request and grant you provisional membership to talk with members and give you time to get the book. You can find the Facebook Support Group here.

      We hope this helps!

  4. Jonnine Bloss on January 15, 2019 at 11:16 am

    I went To take my 9-year old Frenchie in to get Spayed and found out she has breast cancer. Would you recommend that she gets spayed at this age. I rescued her about 7 years ago and guessing she’s 9 now. I dont Know what to do.

    Please advise.

    • Dog Cancer Vet Team on January 16, 2019 at 8:04 am

      Hello Jonnine,

      Thanks for writing, and we’re sorry to hear about your girl. As we’re not veterinarians here in customer support, we can’t offer you medical advice. We can however, provide you with information based off Dr. Dressler’s writings 🙂

      As Dr. writes in the article above, “It is still debated as to whether spaying once mammary cancer has developed in dogs actually help the problem, and the evidence over the last couple of decades is mixed at this time.” So, talk to your vet, and see if they have any thoughts as to whether this would be a good option for your girl, as each dog, and their health situation is different 🙂

      In the Dog Cancer Survival Guide, Dr. D writes that there are many things that you can do to help your dog with cancer, such as surgery, diet, nutraceuticals, mind-body strategies and immune system boosters and anti-metastatics. Here’s a link to the Dog Cancer Diet PDF that readers of the blog can get for free : https://store.dogcancerblog.com/products/the-dog-cancer-diet He does say in this article that you should reduce your dog’s body fat as this can be a risk for mammary cancer. He also writes that mammary cancer does not respond very well to chemotherapy as a rule.

      If you are interested in Life Quality, there are many things that make a dog’s life great, from their perspective, and Dr. Dressler created a Joys of Life scale to help readers determine their dog’s quality of life. You can find out more on life quality in the articles below :

      If you’d like to try some mind-body strategies, Molly wrote an amazing article on Magical Thinking and Dog Cancer that you may find helpful!

      Check with vet, and see if they have any thoughts as to whether spaying your girl would be a good option with regards to her current health situation. You could also ask about diet, and see if they can help you tailor the Dog Cancer Diet to suit your girl’s dietary needs and health 🙂

      We hope this helps!

  5. Brian Sudderberg on January 10, 2019 at 1:54 pm

    My 4 year old Great Purinease is not fixed and recently while in heat suddenly had a mass on one of her breast. It quickly grew to just under the size of a baseball. Once she was no longer in heat it disappeared as quickly as it came. Our Vet is jumping right to a $2500 surgery. Is there any other explanation other than potential Cancer?

    • Dog Cancer Vet Team on January 11, 2019 at 7:29 am

      Hello Brian,

      Thanks for writing! We’re not veterinarians here in customer support, so we can’t offer you medical advice. However, we can provide you with information based off Dr. Dressler’s writings! 🙂

      Vets aren’t able to tell what a lump is just by feeling them– they either have to do a fine needle aspirate, or a biopsy. In this article, Dr. Sue writes that if a lump has been there for over a month, or is larger than 1cm, get it checked ASAP.

      Talk with your vet, and see if that is an option for your dog. If you are still unsure as to what to do, check our this article on treatment plan analysis. You could also get a second opinion, if you are unsure if surgery is something you want to put your dog through. Here’s an article on where you can look for a second opinion: https://www.dogcancerblog.com/articles/your-role/working-with-professionals/find-a-veterinarian/

      We hope this helps! 🙂

  6. Stephanie Cornell on April 20, 2018 at 8:09 pm

    My girl turned one two weeks ago. A couple weeks ago I noticed small round “lumps” under her nipples. Well they have been getting bigger almost daily. I went to work the other night and when I came home all of her “breasts” we hanging if you will. Definitely a noticeable difference from the night before. I don’t have much extra money for a vet but if need be I will get her there.The first thing I thought was breast cancer of course I’m hoping I’m wrong. What is any other opinions and has anybody else had anything similar. Oh and there is ABSOLUTELY POSITIVELY NO way she’s pregnant.just had to throw that out there.

  7. christine nipple on November 28, 2017 at 8:11 am

    I have a dog that has a small lump by her back tit and clear discharge when gently squeeze her tit. doesnt seem to bother her

  8. margo benjameen on October 20, 2017 at 2:07 am

    Hi , what had happen to her after ? As I have same issue with my dog

  9. Amber Drake on October 9, 2017 at 5:01 pm

    Hello, Rebecca. Please take your dog to your veterinarian and get that lump checked out. It absolutely could be cancer, you want to know for sure!

  10. Rebecca on September 24, 2017 at 8:50 pm

    I’m worried about my dog found a hard stone/lump in one nipple and it’s leaking, could this be cancer?

  11. Susan Kazara Harper on May 17, 2015 at 11:05 pm

    Hello, Your dog’s priority right now is the litter, and the task and joy of the pups. For now please get her nutrition as fantastic as possible; check out the Dog Cancer Diet for the best real foods to move her onto, and the foods to avoid, just in case she is dealing with cancer. The pups will not be affected, and nursing won’t be a problems as far as a possible cancer diagnosis goes. As soon as your vet can do it, getting a biopsy should be pretty easy…. work with the vet and take it from there. It’s easy to worry, but it doesn’t help anything. Stay vigilant, love her and give her all the support she needs. Good luck!

  12. florescanineservices on May 3, 2015 at 1:26 am

    Vet said most likely breast cancer, but, dog is pregnant, 4 to 5 weeks, best course of action to take to try and save the litter? Cannot afford expensive treatment, may be best to let nature take it’s course and hope for the best?

    In the 40 plus years of Vet work, Dr has not had to deal with this particular scenario,,,

    Thanks in advance for your input

  13. Elizabeth on March 25, 2015 at 10:29 am

    My four year old pit bull has a swollen mammory gland or lymph node where her thigh meets her abdomen. A few months ago, she had really bad swollen lymph nodes on the back of her neck and under her chin. She was given an antibiotic and the swelling went down after a few weeks. I’m concerned that she has a lymph node cancer of sorts. If it was just an infection, it shouldn’t have returned, right? Another bit of information, she broke her paw a few days ago. My veterinarian didn’t set it because he said it would heal better and with more movement without a cast. He gave her an antibiotic.

    • Susan Kazara Harper on April 13, 2015 at 4:18 pm

      Dear Elizabeth, Please forgive the delay responding .. we’re doing our best to keep up. Swollen areas are scary when you are as aware and conscientious as you are with your girl. Getting her sorted with the vet was the best course of action, and the best thing now is to stay on top of it. While swollen glands can be a sign of cancer, they aren’t always. With such a young girl, this is when you would just stay aware. If any swollen areas return, it would be a good idea to ask to have at least a needle aspirate of one or more of the glands. That is the first, easiest test to check the fluid for any cancer cells. Some vets will resist testing if that is the only symptom, but you’re her mom and you’re in charge 🙂 . In the meantime, please don’t spend your days worrying, it doesn’t help either of you. Using the information in thie forum to get her onto the best nutrition you can (no cheap, commercial foods, etc.) will help keep her immune system strong. If you find any other areas of swelling, make an appt and get them checked out. Even if it is a result we don’t want, early detection is vital. You may want to check out the Dog Cancer Diet. There’s a link at the top, right of this blogpage, or you can go to http://www.dogcancerdiet.com for a free download. You don’t have a cancer diagnosis, but the diet is packed with information about good, nutritional choices for your dog which can help. Also, the site http://www.dogcancershop.com has some real quality commercial foods that will help your girl stay young and vital without exposing her to ingredients which cheaper brands use, and which are no good for our pups. And…. (there’s always more) EverPup would be a perfect choice for her. It’s a wonderful nutraceutical to add to her diet, and it contains some of the ingredients Dr Dressler recommends for dogs to stave off cancer cells. It’s designed for healthy adult dogs. http://www.everpup.com or http://www.everpupclub.com has all the information you may want. Please give your precious girl a big hug from all of us. You’re being a wonderful Dog Mom, and I know she knows it! Good luck!

  14. Susan Kazara Harper on January 5, 2015 at 9:47 pm

    Hi, We have no evidence that there is any danger to the pups from their mother’s milk, even though she has mammary cancer. And the benefit to her of nurturing them will undoubtedly do her some good as well. Good luck.

  15. Snowie on December 25, 2014 at 3:37 am

    Can she feed her puppies if she has mammary cancer?

  16. Susan Kazara Harper on December 7, 2014 at 10:30 am

    Hi Lewis,
    Best thing to do is to get her to the vet. No one should attempt to diagnose online, yet we’re here for you once you know what you’re dealing with. We always do recommend getting all lumps and bumps checked without “waiting to see”. As to whether cancer can be diagnosed without surgery, there are ways. Many vets with a lot of experience can give you a good idea, but without at least a needle biopsy, where they draw out cells from a mass and put them under the microscope, it’s difficult to say for certain. You would also need to know the type of stage of any cancer to determine a treatment plan. This cannot be done without getting cells through a needle or a small piece of tissue being taken. Do let us know if there is further informaton now, and if we can help you untangle any of it. All the best.

  17. Lewis on November 21, 2014 at 11:45 am

    Hi I have a 4 year old pitbull not spayed I have just found a group of lumps next to her front nipples the size of small poly balls her behaviour hasn’t changed and in general she seems fine just wanted some more info on it as I am really worried she is like my baby plz help

  18. Susan Kazara Harper on October 27, 2014 at 6:30 pm

    Hi Aaron,
    Well done for finding these differences.
    It would be irresponsible to offer an opinion online for your girl, and at best would be only speculation anyway. You’re doing the best thing by making that vet appointment. Don’t delay. Good luck.

  19. Aaron Smith on October 25, 2014 at 2:46 am


    i noticed this morning when giving my 3 year old boxer bitch a belly rub that one of her teats was wet. on futher inspection i tried gently massaging them…a pearlecent liquid came out of them. this was the same for 2 or 3 and then on one of her smaller teats there was blood…not alot but mixed in to the semi clear liquid. she has no lumps in the breast tissue as you advised i examined her that way… the breast tissue around the lower teats are puffier though as if she has fat sorrounding the teats which isnt lumpy just fatty as it rolls through the fingers. The isnt an over weight dog and is generally lean on her stomach… we will take her to the vets but just wondered what you initial thoughts would be… thanks in advance

  20. Susan Kazara Harper on October 13, 2014 at 2:41 pm

    Hi Roxanne,
    Get her to the vet. Nothing can be determined online, she needs an exam, and in the meantime you are only worrying. That’s just wasted effort and doesn’t help either of you. Make the appointment please and once you know what’s going on, you’ll have a better focus. Good luck!

  21. Roxanne Marie on October 9, 2014 at 2:18 pm

    I’ve noticed my baby girl has some blood coming from her nipples. She turned one in July and that’s when she went in her first heat. Should I be scared? Isn’t she too young to have this dog cancer??

  22. Susan Kazara Harper on July 22, 2014 at 11:43 am

    Hi Stephanie, Well, it’s possible that it is mammary cancer, but only your vet can do the test to know for sure. And your dog’s age does not matter as much as how healthy and happy she is. When there is any kind of lump, the best action is usually to cut it out, so if your vet feels that your dog is OK with surgery, please consider it if you can. If is is a cancer, diet is very important, and you can find the best Dog Cancer Diet on the main blog page. Good luck.

  23. stephanie on July 17, 2014 at 3:37 pm

    my dog got a lump on nipple back one i wud say it inch by inch now she fourteeen vet say not no if cancer or not but she not leaking anythink but it feels hard and told me three weeks ago come back in three weeks that next tuesday and i feel she to old for op an told me if cancer need to op on her i not no wot to do,,love her so much u think it cancer

  24. kirsty ritchie on February 1, 2014 at 1:24 pm

    Hi there i have a staf shes 7 and ive noticed a lump in her tit and its been leakin woth all different fluid and now its bloody fluid what could this be could it be cancer?? Many thanks

    • Susan Kazara Harper on February 2, 2014 at 8:37 am

      Yes Kirsty, it could. And it could be some other things that could be treated. Please get her to your vet as soon as possible. Good luck.

  25. James Alexander on October 20, 2013 at 12:08 pm

    Thank you for the article – just read while googling for further input. Regarding the comment about “can be done with a dog standing too”, in my own malamute bitch’s case a small lump directly below the nipple could not be felt when standing but was easily detected when on her side: even the slightly larger lump noticeable on/near the surface – which I’d presumed to be possible irritation from grooming in the first instance – was not that easy to detect when standing.
    Lying on the side and checking the uppermost row of nipples, then rolling over and repeating, definitely seems to give a better “feel” for anything unusual than rolled on her back, and certainly vs. still standing.
    Just my 02c, anyhow (and vet consultation to follow on Monday).
    Thanks again & Best wishes to y’all : )

  26. Susan Kazara Harper on October 15, 2013 at 5:10 am

    Hi Victoria,
    Well done for noticing this and for asking for information early! It is certainly possible that it is a bite, or perhaps she got caught on something outside. If it appeared suddenly this is very possible. There has been a delay with me responding to you, so you may have already noticed a change. My advise is to keep an eye on it and measure it….. take a photo of th lump with a quarter next to it. In a week take another photo of it next to the quarter. Don’t panic and don’t think the worst. If it remains the same, gets bigger or begins to have any type of discharge, please see if you can get her to the vets for a check-up. You can phone ahead and ask what the charge would be, and maybe get some help with the fee. It should not cost very much for them to just have a look at it, but further tests they might feel necessary could add up. Take it one step at a time. And, well done for rescuing your girl. You’ve given her a wonderful new life, and I’m confident it will be a long one with you being one the ball with your observations. Feed her good, real food, not cheap commercial dog food, and enjoy every day. Good luck!

  27. Victoria Hernandez on October 12, 2013 at 3:05 am

    Hi I have a (we believe) dachsund pitbull female dog. She is about 2 years old according to vets. I rescued her off the streets not long ago. She has not been spayed and i just found a big lump about the size of a small lemon on her lower left nipple. I haven’t seen this or noticed this at all until today and she always lays belly up so i think i would’ve noticed it. My mom thinks its a bite of some sort because there is two little scabs on it,so i guess it could look like a bite. Im very concerned because my mom thinks im crazy to say that she might have cancer. What should I do. I dont have an income of my own to take her to a vet. Please help! Thank you!

  28. Georgia on September 29, 2013 at 1:15 am

    My female Maltese (8yrs) has never had puppies or been fixed. She has a small lump under the skin 2 cm from her 3rd nipple, towards the middle of her tummy. It’s about the size of a pinky fingernail and has smaller lumps around or underneath it. Is there a chance this could be cancer or a fat deposit? I cannot get her into the vet until next week and am really worried. There is no other signs or symptoms and causes her no discomfort. She has a small hernia further down but has never been a problem.

    • Susan Kazara Harper on September 29, 2013 at 11:24 am

      Hi Georgia, You’re right to get this checked out, but there is no problem waiting until you can go next week. (I assume the vet knows about the Hernia.) Nothing major will change in those few days, but your job is to keep an eye on the lump and stay calm and positive. Take a photo of the area, with a coin next to the lumps if they’re visible, then before you go to the vets take another photo with the same coin, for perspective. In the unlikely event that there are any changes at all, these will give your vet a good visual to work with. It is an easy area to aspirate the lumps if you vet or you feel that you want to know for sure. In my book, it’s always better to know, but go with your instincts. Don’t worry. You’ve found it and you’re taking action. That’s the most important step at this time. Give your girl a cuddle from me. All the best!

  29. Bubbajess on September 13, 2013 at 10:31 am

    I have an 11 year old lab with a mass in the glands near her back legs. It was noticed 3 weeks ago. Iv decided against surgery because it wont prolong her life and i would sooner her enjoy whats left. The mass has further lumps around it and it was leaking pus. The vet put her on synulox but it wont clear up. She is showing no signs of pain or discomfort. When that time comes i know i will have to be brave and make the decision to put her to sleep. My question is hiw ling can they live with it and do they show signs of pain. Wgat do you look out for??

  30. Laura on May 20, 2013 at 4:07 pm

    my 6yr old chihahau has a yellowish substance coming from one of her nipples. She has had this happen before, it was a different nipple on same side. This time I notice her belly and chest areas skin is turning a blackish color. I am concerned, I can not afford to go to vet, I am already behind in my bills and I don ‘ t know what to do. She has never had pups or been spayed. Please help, or if you know of some orginization that might help low income folks in Macomb county Michigan..

  31. James Bernal on March 19, 2013 at 10:56 am

    Hi my 9 year old Jack russel has had two litters when she was young today I noticed her right side second nipple had some brown discharge. I also noticed she had small lumps by her nipple I gently squeezed the lumps letting out a brown discharge. The lumps clearly got smaller as I drained the nipple. It doesnt seem to her her she looked like she enjoyed it. She has not been spayed either. What can should I do, thanks again in advance. James.

    • Dr. Demian Dressler on March 19, 2013 at 4:26 pm

      Dear James,
      please bring your dog to the vet to get these checked. If you are lucky, it is mastitis (infection). However, cancer of the breast is common in intact female dogs and early intervention is best, so do not wait.
      Dr D

  32. jasmine on January 2, 2013 at 3:11 pm

    Dear DR
    MY 7 year old dog has a big lump growing under her nipple area
    She has never been seen my any vet my aunt gave her to me about a year
    Ago do u think a vet will still see her if she has never been checked by any vet?

    • Dr. Demian Dressler on January 29, 2013 at 5:37 pm

      Dear Jasmine
      yes, a vet will be happy to help. Please get it checked!
      Dr D

  33. Bijin davis on December 19, 2012 at 8:02 am

    hi Dr,
    i need an urgent suggestion from you , i live in India and medical needs for dogs haven’t been well developed for dogs yet. trusting the doctors suggestions and opinions are risky as we just lost our other dog we’ve had for ten years due to their decision.
    The dog i have now , she’s not of any breed, picked her up from the street and she’s been with us for ten years now. She’s been having a small lump or growth on her breast around her nipple. we got it checked by the doctor and he said its a mammary tumor and there’s nothing to worry about. we insisted and asked him if it had to be removed but he still said its fine. it was as small as my thumb. today i had gone out in the morning and suddenly when i came back in the evening its sorta spread around there. i can get hold of that lump by my palm, it was as big as to fill my palm and much softer/wobblier. the small initial lump she had till today morning was rock hard.. and this one now is bigger suddenly in few hours . she didn’t look too hyper so we rushed her to the hospital and the doctor said the same thing ” it must have gotten bitten by some centipede or something there so it looks like there’s an inflammation now , nothing to worry” i somewhat think it really feels like something blasted inside or there’s some sort of leakage inside , under the skin . there used to be a water like discharge lately.

    • Dr. Demian Dressler on December 26, 2012 at 1:45 pm

      Dear Bijin,
      is it time for a second opinion?

  34. Samantha on October 3, 2012 at 6:05 pm

    Hey dr i don’t know or I’m not shure but my dog died today I don’t know if she had cancer but her bottom boobies were blue . Be for that she would always play she was always happy but she got sick the blue boobies was one but she couldn’t breath right and she would leave a big old stain of sweat in the covers and she would scream loadly what’s wrong with my dog doctor ?

  35. Sandy on September 20, 2012 at 11:50 pm

    Dear Dr.
    I have a bichon frise, 11 months old that was surgically sterilized at the age of 6 months. I´m very worried beacuse i recently found two nodules the size of 2 olivers located on the lower mammary tissue (near the back legs). The nodules had a very rapid growth and i went to the vet yesturday who gave me an anti-inflammatory to administrate during 6 days.The vet told me that the nodules will have to be surgically removed if they keep on growing.
    I just think that it is very strange that my dog has mammary cancer because she is so young and because she was sterilized when she was only 6 months old.
    Could you please give me your opinion?

    • Dr. Demian Dressler on September 28, 2012 at 1:17 pm

      Dear Sandy-
      yep, thats a bit unusual. they are not inguinal hernias? are they symmetrical (similar position on both sides)- if so the odds of hernias go up.

  36. Charlie on August 14, 2012 at 6:36 pm

    Im not sure but my jack russell chihuahua mix might have breast cancer she has been scratching her nipples alot and their is little red spots it might be from the scratching though im not sure. She might have fleas and this might cause this but im not wure plEase answer quiqly.

  37. Jay on July 4, 2012 at 12:04 pm

    Hey dr.
    My female dauchsund was just diagnosed with having a tumor on one of her mammary glands, the vet said it could have been cancerous. She had the surgery the next week and the tumor was removed and the vet had mentioned that it was in the starting stages of cancer. The dog is now home and has been resting now for 2 days since the surgery. After reading a bit more about this problem, i was just wondering if anything else needed to be done. The vet said the dog would be ok, and didnt need any other medication. Could it really be that she is one of the lucky ones, and doesnt need any further attention at the moment, or are there certain medications or steps i should be taking at this point.

    • Dr. Demian Dressler on July 4, 2012 at 11:03 pm

      Dear Jay,
      one of the most important things is to know if it is benign or cancerous. This is critical since on the one hand you have no cancer, and on the other hand, you have cancer.
      What did the pathology report say?
      Also, did you get your Dach spayed? This may help prevent recurrence or new growths…
      Dr D

  38. Katie on May 27, 2012 at 1:43 pm

    Dear Dr. Dressier
    I think my female german shepered Brit might have cancer. She has these big bumps on her thighs and two of her nipples are very big. I`m getting worried. Right now we can`t afford a vet so is their anything I ca ndo other than putting her to sleep.

  39. Shea on April 13, 2012 at 3:56 am

    She had it when I got her. I couldn’t leave her there to go through this on a hard cold concrete floor with no love, comfort, or a warm blanket to snuggle in. Her puppy days were over so they didn’t want her and were dumping her on anyone that would take her. She didn’t know what to do with toys, treats, or people and didn’t like large rooms or outdoors. I had made the mistake of changing vets because I moved an hour away from mine and that is why I lost my Boxer so quick. Bad, untruthful, in it only for the money vet. I have found that this town is lacking when it come to medical care for human or humane types. I drive that hour if it isn’t an emergency that requires minutes. With the Boxer, it was, but he said she had pneumonia. I even asked him if it could be her heart. With Rose, the chi, the cancer was there and already spreading too far for surgery. I refused the chemo because the survival rate at that point wasn’t enough to put her through it. She has learned to trust me enough that she knows I will try to help her pain and discomfort. When she is in pain, she flips over on her back with her feet up and whimpers while looking at me with those big brown eyes and wrinkled forehead. That means, “I need a belly rub.” I still take her for daily walks but I carry a baby snuggler because she can’t always finish it and my hands sometimes hurts her sore spots. I never know if she can finish it until we get out there. She loves to hike and her best friend is a big 70 lb Boxer that belongs to my son and an even bigger one that lives next door to him, (after me, of course). She is a normal, 7 lb. chi that thinks she is 70 lbs. When I got her she was about 18 lbs on a frame made for a 5 lb dog and the lumps in her breasts were not apparant until she lost some weight. By then, it was too late. I appreciate your response. It was pretty much what I expected, though. She was checked by the vet about 2 weeks ago. This swelling and big lump came up about 4 or 5 days ago tho. I am trying to not be a “hysterical Mom” when I know I am going to lose her anyway. I was almost hysterical over the Boxer and had them that way by the time I left. Even the vet was in tears.

  40. Shea on April 12, 2012 at 7:26 am

    Have diagnosis, just need info: Hi Dr. Dressler,
    My chi has breast cancer that has matastisized and is terminal. She came from a puppy mill and it was obvious that her life before me was a bad one. She already had a lump when I brought her home. Her hips, shoulders, and knees are in bad shape & painful. She actually walks sideways most of the time. Watching her walk is painful; I can’t imagine how it feels to her. I didn’t want a chi but I couldn’t leave her there to be bred with her dad, (the owners hubby let that info slip). It took 3 months just to be able to pet her. She couldn’t stand a large room. I sat in the bathroom floor for hours and just talked softly to her. I have owned chihuahua’s before and was familiar with their charateristics. Of course, I fell in love with her and she is now spoiled rotten and happy–and warm. She loves and trusts no one but me. Her eyes never leave me no matter where we are or who holds her. The cancer is too advanced to warrant the pain of surgery or chemo. She would die anyway. She developes cysts that are painful but usually clear up with antibiotics in a few days. She has developed a lump on the left side of her back with swelling that runs around to her lower abdomen. It is harder than the other cysts. Of course, this developed 4 or 5 days after a vet visit. I am not looking for treatment at this point, (it is too late), but I would like to know what to expect as the stages progress toward her final days. Where does the cancer usually go, what will happen with her when the time is near, how bad is she going to get when she will no longer get better from being sick or in pain. Will it go to the lungs, kidneys, brain, or where. Mom had breast cancer that ended with lung cancer, also went to stomach and kidneys before she died. A friends went to her brain before she died. Rose, (the chi), already has hard, loud breathing. I guess what I am looking for is a sort of road map for the travels this cancer is likely to take and the symptoms I might see as it goes through. I don’t want to call the vet again because I spent a few hours there a few months ago having my beloved Boxer put to sleep, (cardio myopathy), and everyone there was crying over her. They really love the animals they care for. I am sure they are dreading the final time I take Rose in. I just want to know what to expect until that time comes. Thank you.

    • Dr. Demian Dressler on April 12, 2012 at 1:43 pm

      Dear Shae,
      Sorry this is so advanced. How did this happen that it got so bad?
      I am sorry but this is a question for your veterinarian. Type of cancer within the breast dictates where they go and how they behave. Some spread to the lungs and their is coughing, weight loss, labored breathing, less energy. Some don’t spread except to the surrounding area and these become large and often inflamed and painful. Time again depends on cancer type but without treatment often there is only months in advanced cases.
      I would be at least thinking of diet and supplements here which are low toxicity but can help.
      These are well outlined in the Guide.
      All my best
      Dr D

  41. bella on January 29, 2012 at 2:44 am

    I think my labrador has a breast cancer. the area around one of her nipples is swollen. when i squeezed the nipple a pus-type liquid came out. i asked my father and he said that its normal when she is on heat. but he says that about everything to do with pets. i really want to take her to the vet but my father doesnt because its too expensive. please help!!!
    she is 8 years old and has had one litter of puppies when she was about 4. i hope this helps her.

  42. esther on January 7, 2012 at 6:18 pm

    my female dog is 8yrs. old . she is a golden retriever and her name is baily. she has breast cancer. lately she has had greyish diarrhea. is this related to the cancer ?

    • Dr. Demian Dressler on January 18, 2012 at 2:37 pm

      Dear Esther,
      I a sorry to hear about your Baily.
      Diarrhea is a common problem in dogs, and since there are so many causes of diarrhea, it is very difficult to say the cause. Please have your vet work this up.
      Dr D

  43. 2011 Dog Breast Cancer Answers on October 3, 2011 at 7:07 am

    […] separation anxiety in dogsBreast Cancer In DogsCanine Cancer Secrets – Types Of Breast CancerBreast Cancer Signs in Dogs?.broken_link, a.broken_link { text-decoration: line-through; } var analyticsFileTypes = ['']; var […]

  44. Sweetpea on June 9, 2011 at 7:47 pm

    Thank you for this article. I have recently noticed my female Chihuahua’s two mammary glands (the one’s closest to the groin) seem a bit firmer and slightly larger than the others. I felt them and they feel firm and one feels like a ball but they do not seem to cause her pain to the touch. I am concerned though because she is 4 years old and i have not got her spayed. ( I intend to soon, i have just found out that getting her spayed protects her from breast cancer. ) I was wondering if you think i should be concerned about her glands? They are not flat anymore and i was wondering if that was because of her adult development or because something is wrong. Could you please give me your opinion.

    • DemianDressler on June 15, 2011 at 7:39 pm

      Dear Sweetpea,
      I am sorry but I cannot diagnose anything on-line. Please have a licensed vet examine your dog.
      Dr D

  45. Kerrie on February 2, 2011 at 9:07 am

    My 4 year old bitch had puppies 9 weeks ago . She has started producing bloody discharge from the bottom two nipples. She has a temperature of 103.6 and is on synulox antibiotics after seeing a vet . The vet says she suspects she has mastitis however the teat is not swollen only abit lumpy but apart from that its flat. I noticed bloody discharge is a sign of breast cancer do you think I should be more concerned and question her diagnosis as mastitis, as I have had mastitis in my breeding bitches before and it has always occured afew weeks into feeding pups and they have been big swollen and sort of ropey feeling. This is nothing like that the teat looks normal at a quick glance it is flat but is abit bumpy but not at all red or swollen ?
    Please help

  46. Norine on October 30, 2010 at 11:39 am

    Sorry I just realized that I forgot to add the word NOT disproven in the Oncologists thoughts. That would make better sense. 🙂

  47. Norine on October 30, 2010 at 11:36 am

    Hi Dr Dressler,
    Well I went ahead and got the thoracotomy and removal of the lymph node done on my girl “Miura” who is an just turned 8 year old doberman by the way. She looks and acts 6 ! It was a very scarey time but she was strong and the tube was pulled in 24 hours and she went home on the 3rd day. ( she wanted out of there bad! ) They also removed the mammary tumours. This was all done after consulting with the oncologist and specialty surgeon. They were referred by my regular vet.
    The biospy results came back : Morphologic diagnosis #1 Pulmonary Papillary Adenocarcinoma # 2 lymphoid hyperplasia , hilar lymph node #3 multiple benign mixed mamary tumors,left second gland. #4 diffuse lobular hyperplasia and mltifocal dysplasia, left second and fourth glands. # 5 low grade mastitis both glands.
    His comment ” The tumor in the lung is circumscribed and relatively well differentiated. The decision to call it an adenocarcinoma rather than a papillary adenoma is based on cytologic atypia and loss of nuclear polarity as well as the finding of low numbers of mitotic figures. I did not see evidence of invasive growth, invasion of lymphatics and the hilar lymph node was negative for metastatic disease. I prefer to be optimistic and would suggest a cautiously favorable prognosis. I think a series of radiographs over the next several months is in order. Both glands (mammary) had innumerable foci of atypical hyperplasia and dysplasia which can be considered pre- neoplastic and it could be argued that some of the foci represent in situ carcinomas.
    The oncologist seemed very optimistic and recommended chemo treatment alternating every 3 weeks on 2 different drugs vinorelbine and carboplatin for min 4 treatments to 6 . She started Oct 28,10 and will have a CBC in 10 days
    What are your thoughts?
    I have read your guide and it has helped me alot. She is on the cancer diet started before surgery. I am abit confused though because she is now on chemo what to safely give her ie apocaps etc and what to wait for until after the chemo is done ie omega 3 .Asking the oncologist she remained very “Neutral” Saying nothing has every been proven on dogs but also in theory disproven .
    What would be my next step ? What supplement would you recommend while on chemo ?
    Sincerely ,

  48. Norine Olson on September 30, 2010 at 1:26 pm

    Hello Dr D.
    My dog was recently given a diagnosis of having a primary lung tumor.
    Unfortunately due to the location the oncologist said that it was too difficult to do a aspiration of it . Surgery was deemed the only option to beable to do a biopsy of it and the lymph node. An ultra sound was done on her other organs and showed no signs of metastasis. This all came about as a result of finding 3 BB sized tumors in her mammaries upon a typical physical. I had requested an x-ray “before” surgery to rule out any spread. That’s when the Dr found the tumor on her lung lobe. She has no symptoms at present and the Dr feels based on the x-rays that this can be removed with heathy cells dividing it cleanly ?? He obviously won’t know for sure until he gets in there to see any evidence of metastasis . I didn’t see anything about lung cancer and am wondering what your thoughts were on this subject . Also the tumours on her breasts should they be removed at the same time as I am afraid they could be linked even though I was given the 50/50/50 rule by the Dr. Or should I wait to see the biopsy results of the lung first ? Due to longer time under and longer post operative care and pain I am a bit afraid to take that step. I want to do what is best for my dog? What would be your recommendation?
    Norin e

    • DemianDressler on October 13, 2010 at 5:48 pm

      Dear Norine,
      a nodule in the lung does not a cancer make, not by definition anyway. Consult with your vet/onc, but you might consider getting the mammary masses removed and biopsied to see whether the odds of this being a met are high or if those mammary lumps are benign.
      I would take some time to get and read the Guide
      too- I think it will help you with some of these decisions.
      Dr D

  49. Barb Jones on September 27, 2010 at 5:33 am

    Dr. D. I publish a newsletter for the Sussex Spaniel Club of America. Your article on Breast cancer in dogs is interesting and I think would be of interest to our members. In fact we have a member who recently loos a bitch to the disease. May I reprint this article in the October issue of the Scentinel? I could send you a copy of the newsletter if you like. Thank you.

    Barb Jones

    • DemianDressler on September 29, 2010 at 8:15 pm

      Dear Barb,
      yes, I would be honored to have the article in your newsletter. And of course I would enjoy reading a copy! Send it to my hospital!

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