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Why is my female dog having a pus-like discharge from her vagina?

Updated On September 23rd, 2025

Pet's info: Dog | American Pit Bull Terrier | Female | unspayed | 4 months and 30 days old | 28 lbs

Why does my female dog have a vaginal puss discharge?

1 Answer

Most Helpful Answer

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Answered By Ann Dion, DVM

Veterinarian

Published on November 18th, 2017

Hello and welcome to Petco Pet Education Center, formerly Petcoach. A 5 month old female dog with SMALL amounts of puss from the vagina can be something called 'puppy vaginitis' which is a common condition that is resolved by having the puppy spayed. If there is a LARGE amount of puss present then a life-threatening condition called pyometra could be the cause, in which case she needs to go to a vet right away. Pyometra is very uncommon in a 5 month old puppy and most often always requires a dog to have had a heat first, so puppy vaginitis is most likely. This could also be a urinary tract infection resulting in puss from the vulva. I would have Baliey seen by your vet to be assessed, and have her spayed sometime in the next month or two. Best of luck with her!

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