Petco Text Logo
Petco Pet Logo

My dog has a growing lump on her tail. Is it cancer if she's fine?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 45 lbs

My dog has a lump on her tail that's been there since she was only months old, but now it has grown. The odd thing is her behavior isn't changing and she doesn't lose her appetite or anything strange. She once ingested aluminum and vomited but nothing has happened since, which was approximately 2-3 months ago. I'm wondering if it is cancer and I'm aware that I should get a fine needle test I believe is what it's called but I wanted to know a bit more before I take her to the vet.

This question includes photos that may contain sensitive content. Click to view.

View more to consider that the photos may include sensitive content.

1 Answer

Most Helpful Answer

Image profile

Answered By Megan, DVM, CVA

Veterinarian

Published on July 9th, 2017

I am as well concerned about the possibility of cancer. The good news is that it has been there for awhile so sometimes they will get larger if it gets infected. Or if it is a fatty deposit they can also grow as dogs gets older. Unfortunately cancer is also a possibility. With it being on her tail, I would get it checked out soon before it gets much larger. If it does need to be surgically removed it is easier to remove the smaller it is because of its location. If it gets really large, the veterinarian will have a difficult time removing the whole thing since there is limited skin to work with on the tail. I hope this helps.

Vote icon

1Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored