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My puppy has a sudden, painless bump under her jaw. What is it?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | unspayed | 4 months and 3 days old | 21 lbs

Hello, our 4 month puppy developed a bump about the size of half a small rubber bouncy ball on the underside of her jaw. It happened in a matter of few hours and seems to have maybe shrunk a little in the last 24 hours. It hasn't affected her mood and causes her no pain. Any ides?

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1 Answer

Most Helpful Answer

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Answered By Jyothi Alagappan

Veterinarian

Published on June 21st, 2018

Hi and thank you for using Petco Pet Education Center, formerly Petcoach! I notice the bump on Clover but unfortunately, it is generally impossible to tell what the lump is based on appearance alone. It can be anything from a bug bite (especially since it has gotten smaller), a mass, an abscess, a cyst, a salivary gland or something else. If it is not bothering her right now and does not get bigger, I would monitor her. If it is still there in the morning, I would contact your veterinarian. Your vet may want to feel the area and determine if additional diagnostics are warranted such as a fine needle aspirate OR something else if it does not seem like a mass/cyst/abscess. Good luck!

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