Male Dog Penis And Sheath Discharge

The phone call started in an ordinary way, “Dr. Randolph, I need to make an appointment for Gus.”

A quick glance at Gus’ file in our computer system showed he wasn’t due for a routine visit, so I inquired of his owner about possible problems as a reason for the visit.

“He has a yellow-green discharge from his penis.”

A yellowish to greenish small-volume discharge from a male dog’s sheath is normal.

I closed the appointment book, and pressed F1 on the keyboard, sending the computer software back to the Main Menu.

“No appointment needed,” I explained to Gus’ master. All male dogs have a yellow-green discharge. It’s actually coming from the sheath, not the penis. Quantity can vary from undetectable to a drop, but it’s all normal.”

The material, which looks much like pus to the naked eye, is actually made of cells and lubricant fluid in the prepuce that surrounds the penis inside its protective sheath. It has a pungent, acrid smell and will sometimes be noticed where a male dog has lain.

Discharges from the sheath with other characteristics, such as blood, or a large volume of material that resembles pus, would be a cause for concern.

As for me, I’ll just have to wait for a big, sloppy Gus-kiss until another day.

See you tomorrow, Dr. Randolph.


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  1. My 9 month-old shih tzu also has pus discharge, and his penis was swollen. Last night, his eyelids and mouth were swollen too and he was very irritated. Could this be UTI or another health problem?

  2. My male dog is a 4 month old old pitbull. Recently, he sat under my legs like usual but some chunky white substance came out of him before he peed under me and walked it in front of the bathroom door. Very out of character… Should I be concerned about a UTI?

    • You would be concerned about UTI if he were urinating excessively often, having urine accidents, blood or bad odor to the urine. It doesn’t sound like there is a problem, but, at 4 months of age, he hasn’t finished vaccinations (unless he JUST had a visit), so, it would be wise to discuss it with his doctor. Thanks for reading, Dr. Randolph.

  3. I noticed my dogs discharge recently and it has a very bad smell. Do I need to get him to the vet?
    Thank you.

  4. my almost one year old puppy has this but I am worried because he has been out in the cold a lot since it snowed again and I didn’t notice it until he had a long adventure out in the snow and I am worried about him having frostbite

  5. Thank you for the info. I’m now at ease. My puppy has a small amount of discharge (matched the description above) and i panicked thinking he has some kind of infection.

  6. I have an 8 week old pup with this discharge and it seemed to be quite hard? I managed to remove it without any discomfort to our pup. We have already visited the vet for the first for the first vaccination and check and told everything is okay and he’s in good health. This was only noticed later. I have kept a sample, can I send an image or should I take it to our Vet?

  7. Your article put me at ease, however I want to confirm that this discharge you’ve described and shown in the article is normal in neutered dogs? Your article doesn’t specify intact vs neutered and google is giving conflicting info. Thank you so much!

  8. We have noticed that there is quite a bit of this discharge coming from the same area on my German Shephard. I have to have my couch washed because where he sits there are now stains of this stuff. He has also gotten it on my bed sheets… anywhere he lays down. Could this be a UTI? I just want to know why there is so much.

  9. Your comments are very helpful. Bomber our 2 1/2 yr old Rottweiler has not been fixed yet but I was also wondering if when we stud him out will it stop?