My dog has a new, red, hard lump in his armpit. Should I worry?
Updated On September 23rd, 2025
Pet's info: Dog | Mixed Breed Large (61lb +) | Male | unneutered | 2 years old | 70 lbs
My Shepard mix has a medium sized, red, hard lump on his "arm pit". It doesn't seem to hurt but it is concerning as it popped up out of nowhere.
2 Answers
Most Helpful Answer
Published on October 12th, 2017
Thanks for using Petco Pet Education Center, formerly Petcoach! Based on its appearance, this could be a benign or malignant mass. This is most of the time differentiated with a test called a fine needle aspirate which is easy, cheap and pain-free. Sometimes, a biopsy is required for a diagnosis. Have Panzer evaluated by your veterinarian to have this test performed to try to sort out what the diagnosis is so that the best course of action can be determined. Keeping my fingers crossed that it is something benign!
2Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on July 5th, 2018
Thanks for using Petco Pet Education Center, formerly Petcoach! This could be a benign or malignant growth. There is no way of knowing what it is just based on its appearance. This is often differentiated by a test called a fine needle aspirate (FNA) which is a pain free, inexpensive and easy procedure which in most cases will help reach a diagnosis. Sometimes a biopsy is needed for a definitive diagnosis. I recommend that you have her evaluated by your veterinarian for further assessment and treatment. I am really hoping for something benign. Good luck and have a good day!
1Pet Parents found this answer helpful
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