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My dog's sheath discharge returned after antibiotics. What to do?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | neutered | 55 lbs

My dog has been battling with these symptoms since I adopted him. He has yellow/green discharge coming from his sheath. I recently noticed a black blister and dark ring around the outside. The vet had him on antibiotics and it cleared it up while he was on it but it came back as soon as he stopped taking them. He is neutered. He is on a special bladder stone diet. Is it allergies? Yeast infection? What do I do?

1 Answer

Most Helpful Answer

Answered By Lauren Barry, BVSc, MRCVS, DVM

Veterinarian

Published on September 25th, 2017

If the discharge cleared while Zion was on antibiotics, then it's likely a bacterial infection of the sheath. He may need to take a longer course of antibiotics, or your vet may suggest a bacterial culture and sensitivity test to determine the most effective antibiotic. Typically, skin infections and penile sheath infections clear faster with topical therapy as well as oral medicine - talk to your vet about using a diluted antibacterial flush to clean the area. I'm not sure I can explain why he had a black blister, but maybe a bruise or injury from licking himself? Recurrent skin infections and bladder stones and crystals can sometimes be due to an underlying medical condition- if it's not been done already, some blood tests to check for endocrine illness may be a good idea. Your vet will want to work with you to help resolve this condition permanently.

1Pet Parents found this answer helpful

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