Petco Text Logo
Petco Pet Logo

My dog has a soft lump in her armpit that changed. Is it serious?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Female | spayed | 35 lbs

My dog has a little lump that now is less under the skin and is exposed on the skin. It’s small like a pea and soft. It’s been there for a little while but it seems to have changed now. It’s in her arm pit. She’s a 6 year old rescue mutt.

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 Ana M, DVM

Veterinarian

Published on May 16th, 2020

Thank you for submitting your question regarding Ella. It is not likely an emergency, but I do recommend having the bump evaluated by her veterinarian. It appears small and hopefully is just a benign growth. Her veterinarian will likely perform a procedure known as a fine needle aspirate to determine if the bump is benign or not. The veterinarian will use a small needle to collect a sample of cells to evaluate under the microscope. Based on these results, treatment can be started if necessary. I hope this information 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