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Why does my 3-month-old puppy have a lip sore and what to do?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | unneutered | 3 months and 7 days old | 20 lbs

Why is there a sore on my 3 month old puppy’s lip

1 Answer

Most Helpful Answer

Ann Dion, DVM

Answered By Ann Dion, DVM

Veterinarian

Published on October 28th, 2018

Hello and welcome to Petco Pet Education Center, formerly Petcoach.
Sores on the lip can be caused by many different factors, but most likely is she chewed on something that has caused a wound. Other possible causes are immune diseases that attach the junction between the lip and the haired skin, however this is very unlikely given her age and the localized region.
It does look like the wound might be infected however, so getting it seen by a vet to see if antibiotics are required is a good idea.

If it doesn't bother her, and she is eating/drinking ok, then you can try just keeping it clean with a salt-water solution, and monitor. If it looks better every day then keep monitoring, but if it isn't better after a couple days, or looks worse at all, then bring her to a vet right away.

Do not apply any medications/creams, just keep it clean with salt-water. If she is pawing/scratching at it then an E-collar to prevent more trauma can help it heal, and if it is bothering her getting it seen by a vet is a good idea.

Best of luck with Ozzy!
Vote Icon1Pet Parents found this answer helpful

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