My old unspayed dog has a growing breast lump. Could it be cancer?
Updated On September 23rd, 2025
Pet's info: Dog | Staffordshire Bull Terrier | Female | unspayed | 14 years and 8 months old | 70 lbs
My dog is 14 a Stafford bull terrier. She has a lump on under her breast towards the back of her. In the last few weeks it has got quite large. I’d say it’s about 3 inches in length and 2 inches wide, Ive Google’d somethings it could be. She’s got arthritis in the last 6 months so when she goes to jump on things she is sort of straining as sometimes she can’t get up. Do you think this could be a hernia?! Or the horrible dreaded illness Cancer! Again she’s had it a while but its got a lot bigger.
2 Answers
Most Helpful Answer
Published on November 14th, 2017
An unspayed female dog with a lump on one of the teats is almost always breast cancer. It could either be malignant or benign but, since you stated it has grown very large in a short period of time my guess is that it is malignant. it is very unlikely to be a hernia. It is possible, just not likely. You really need to get her to your vet for an exam so you can get a proper diagnosis and discuss treatment plans. Hope this helps. Best wishes to you and Kodi.
1Pet Parents found this answer helpful
Related Answers from Veterinarians
-
Published on November 22nd, 2017
If those lumps are associated with her mammary glands (teats) then this can be very serious. It could be cancerous tumors (breast cancer) and that is what they appear to be at first glance. This is very common in female dogs that have not been spayed. Of course it is impossible for me to diagnose over the internet. It is best to get her to your vet for an exam and they can help determine what is going on and how best to treat it. Other options are that they could be cysts or abscesses, I strongly suggest you have her checked as soon as you can before those get larger or spread. Best wishes.
1Pet Parents found this answer helpful
Hello, I have a Rottweiler named Bella. She is 6yrs old. She has not been fixed. She has a knot in her breast about this size of a balled up piece of notebook paper but more egg shaped and the knot is lumpy. She doesn't act like it hurts when I touch
Hey, sissy is 6 years old and the other day I was feeling around and I felt a hard pea sized lump in her breast. It doesn't move and it seems like here lately she's been howling and whining more until I come to her besides that she acts the same as a
I need to know if this lump is anything to worry about or not
If dog has a large lump/tumor say maybe around the size of a tennis ball or maybe smaller (see pic). Plus several small ones in the mammary. Vet told us there’s ulser there. And he says it’s likely cancer. Does this sound like cancer? He thinks it’s
I noticed today my dog has multiple tiny lumps right around one of her nipples. She’s always had spots that have a bit more fat to them (im not really sure what it’s called) but never hard tiny lumps. I’m worried because she’s not spayed and I know b
My 1 year old labrador has a lump under one of her nipples. Her 5th gland. I have checked her other nipples and there are no lumps under any of them. She finished her first season about two weeks ago. Is this cancer?
My unspayed dog has developed three little blue hard lumps next to her nipple . They don’t seem to bother her.
You My vet took a sample from a lump she's got on her tummy between the last nipple & 2nd last nipple & he came back in the room & said she's got cancer but thought they would send it away to get results
My 8 year old chihuahua has a hard lump under her breast ... what could it be ?
My female English springer spaniel has a lump that is white and blue on her milk sac. I was wondering if you could tell me what it is. She is 10 years old and she has had puppies
Book an appointment with the pros – our expert vets are here to help.
