If you own a male dog and you have ever noticed a discharge from his penis, you are not alone. In fact, this is a normal thing for male dogs, especially those who have not been neutered. This discharge is known as “smegma.”
A concerned pet owner asked me about it afraid that his dog had an infection. I offered to look at the dog to confirm; however, when I arrived, I didn’t notice any discharge or foul odor.
Smegma is a normal discharge from the penis. It is caused by a buildup of bacteria around the shaft of the os penis. It is a thick exudate usually white, yellow, or green in appearance. It might even look like pus. Under ordinary circumstances, there is nothing to worry about.
Unusual circumstances could lead to an infection that will require veterinary care. Under ordinary circumstances your dog will clean it himself but if it becomes a nuisance, simply wash it away with water. You only need to be concerned if your dog strains to urinate or you notice swelling. If this happens, take your dog to the vet right away.