Petco Text Logo
Petco Pet Logo

My rat has a large, hard lump between her back legs. Is it a tumor?

Updated On September 23rd, 2025

Pet's info: Other | Unknown - Other | Female | unspayed

She has a GIANT lump in between her two back legs. And i mean HUGE... we dont ahve the money to bring her toa vet that takes rats because those are really expensive. Its a very hard kump, but it doesnt hurt her when i touch it or anything, She still eats and drinks water and comes to see me when im close to her cage. I can give more information later. I doupt theres anything i can do but this is better then nothing

1 Answer

Most Helpful Answer

Image profile

Answered By Mallori Kaminski, BVSc

Veterinarian

Published on February 21st, 2017

There are a couple of possibilities for what the lump is on Muffin. It could be a mammary tumor, or and abscess. The only way you will be able to definitively tell which it is is to take her to a veterinarian for a fine needle aspirate, where the vet will stick a needle into the lump and look at the collected cells under the microscope. Either way she will likely need surgery to remove it, and there is a chance that it is too big, or in a risky location for surgery. If she is otherwise well in herself then you can continue to monitor her and look for signs of her being uncomfortable. However if she stops eating, drinking, acts lethargic or starts having trouble moving due to the lump then she needs to see a veterinarian as it has become a quality of life issue and she may need to be euthanized.

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