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.


  1. My senior dog woke up ok with dry material over his legs and surrounding areas that his penis touches when he is sleeping and then noticed a white-greenish discharge from his penis. He is neutered. Then, while I was inspecting him ( he has sensitive skin), he dropped its discharge about 12 hrs later. I cleaned his penis, and he smeared the lapel towel a little bit. The discharge is odorless, and I touched all of his body, and he does not seem to have any discomfort. He appears fine and peeing normally. What to do?

  2. My 10-year-old dog is discharging a lot of white/greenish substance. He even dripped onto the floor and all over his belly area. It doesn’t smell bad and he is not licking it. What should I do?

    • I detect a high level of concern, and I’m keying on the phrase “dripped onto the floor and all over his belly area.” Get his doctor to check this out, then, write back and let us know what he says. Thanks for reading, Dr. Randolph.

  3. Hi Dr. Randolph, my puppy is 14 weeks old and he has this discharge problem, which I have been cleaning with soap and water, however, my vet has tried to get his penis to unsheathe and she has not had any success, his balls have not dropped yet either. Should I take him to a specialty vet for this or wait until he is a little older? He doesn’t seem to mind and is not in pain, however, he does pee alot! Like 3-5 pees in 10 mins. Thanks!

    • I’ve never told this story, but, about 10,000 years ago, I had a male puppy with this typical discharge, which, I repeat, is normal. I didn’t know that then, though, when I was a young student at Ole Miss. I took my puppy to a doctor who diagnosed “persistent penile frenulum.” He clipped the frenulum with scissors and pronounced the puppy, Sam, to be perfect. Of course, the discharge never changed, because it’s NORMAL. It may be, then, that your puppy’s penis won’t come out because the frenulum is persistent, and, thus, still intact. That has nothing to do with testicles descending into the scrotum, which might just need some more time, or, your puppy may be cryptorchid. There is no rush, and cryptorchidism surgery can be done at a later date. Write back in a few months and let us all know how the two matters turn out. Thanks for reading, Dr. Randolph.

      • Hi Dr. Randolph! My 7 year old dog has been licking his private area more recently and it looks a bit inflamed and has yellowish green discharge coming from it. He seems to be peeing normal. My regular vet can’t see him for another week, should I wait that long, or try to get into another vet? Thanks!

        • If his activity level and appetite are good, he’s not having any vomiting or diarrhea, coughing or sneezing, and he’s not drinking excessively, it should be OK to wait. Thanks for reading, Dr. Randolph.

  4. Hi there. My male neutered dog has always had discharge since we adopted him over a year ago. We realised that meats like beef actually made the discharge smell terribly so stopped any beef and venison etc. Every now and then (like today), his discharge seemed to have red/brown spots in it rather than the usually yellow and was definitely thicker. Had a metal smell to it also. Is this normal in male dog’s? He does seem fine anyway though as he’s a greyhound they do hide issues rather well.
    Thank you

    • I don’t like the red/brown color, but “metal smell” fits the “pungent, acrid smell” I describe in the article. Does he have any discomfort in the preputial area? If so, I’d definitely want to have it checked by his doctor. Thanks for reading, Dr. Randolph.

  5. My male puppies are about 5 months old and have a pure white discharge coming from there penis but they aren’t humping

  6. My dog went to the vet a few months ago because he was struggling to urinate. It seemed to bring him discomfort when he had to pee. We did all sorts of testing and everything came back negative so they gave him an anti-inflammatory. We finished the medication and things have been fine since. I noticed this morning he had a discharge coming from his penis and yesterday and today has been looking a little bit more than normal. He does not seem to be in discomfort right now, what should I do?

    • As I said in the piece, SOME discharge is NORMAL. Since he’s otherwise acting fine and doing fine, I see no reason to change anything AS LONG AS “fine” continues. Thanks for reading, Dr. Randolph.

  7. My dog is excessively licking his private area and it only bothers him when he is standing up and when he sits down he doesn’t whine when he urinates

  8. My 5 year old dog is not neutered and he has recently been aggressively licking his penis and then when he gets up there’s a little wet spot (clear and odorless) on the floor – nothing appears swollen or wounded. Is this normal?

  9. My dog’s a rescued dog, and not spayed yet, ( it’ll heppen next month) is this kind of discharge gonna stop after the surgery?

  10. My pup I rescued got neutered and fo The past 2 months he’s been having discharge and been licking himself like crazy? He’s going on 18 months? Is this normal?

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