Two Easy Ways to Start Earning Rewards!
Earn 2X Pals Rewards points at Petco
when you use Petco Pay!
Updated on September 23rd, 2025
Pet's info: Dog | Chihuahua | Male | unneutered | 8.5 lbs
My dog has developed this brown spot underneath his arm. He limps when he walks and I am not sure if it connected, but he also has a very pungent odor coming from him when he has not smelled like this before. I am worried because I was hoping it would go away but he seems to get worse. I am not sure what this is or if I should be very concerned.
1 Answer

Answered By Jenna Beyer, DVM, MBA, cVMA
Veterinarian, Certified Veterinary Acupuncturist
Published on November 15th, 2018