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What's the discharge on my unneutered male dog's penis? Is it normal?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | unneutered

Hi. This substance is always on my dog’s penis, even if he’s just peed and I cleaned him. It doesn’t smell like anything, does pees normally, no signs of pain or struggle, pee usually is normal or is in an spraying action which I think is when he’s marking. He had X-rays a few weeks ago, which I’m attaching both substance and x-ray photo below. Is it worrying? What’s the substance? Is there anything unusual in his x-ray?

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4 Answers

Most Helpful Answer

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Answered By Stephanie Echols, DVM

Veterinarian

Published on March 11th, 2020

Thanks for using Petco Pet Education Center, formerly Petcoach! The discharge you are seeing is a normal substance that unneutered males produce to lubricate the penis. Sometimes the discharge comes out of the prepuce. The production of this substance is decreased when pets are neutered. You can continue to wipe it off it noted but no treatment is needed. Kisses to Simba!

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Other Answers

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    Answered By Dr. Leigh, DVM

    Veterinarian

    Published on March 1st, 2017

    Many male dogs will have a small amount of thick, white/yellow discharge from the prepuce, which is called smegma. It is usually a normal occurrence unless there is an excessive amount, excessive licking, or you see any redness or swelling

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    Answered By Andrea M. Brodie, DVM

    Veterinarian

    Published on November 3rd, 2016

    Yes, there can be a discharge. This must not necessarily be seminal fluid. Many unneutered male dogs have a chronic infection of the prepuce which can show as a clear to milky, sometimes yellow or greenish discharge. If he does not lick his penis constantly and it does not bother him, then this is nothing to worry about. Castration will usually cure it.

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    Answered By Ricardo Fernandez, DVM

    Veterinarian, Veterinary Oncology Resident

    Published on September 26th, 2017

    Thanks for using Petco Pet Education Center, formerly Petcoach! This discharge you describe could be something called smegma which is normal and expected. However, if this discharge is excessive thick, yellowish and has a foul odor associated with it and the tip of his penis is red/irritated, have him evaluated by your veterinarian as this could be a sign of infection which may require antibiotic therapy. Good luck and have a good day!

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