Havanese Licking His Penis With Darkened Skin

Constant licking can darken the skin over time, and a tender area suggests irritation or infection. Common causes include a bacterial or yeast infection, an infection of the sheath, allergies, or irritation from grooming products.

If the pink part of the penis itself has turned dark, is swollen or won't go back into the sheath, see a vet the same day. In long-coated dogs, hair can wrap around the penis and cut off its blood supply. Otherwise, have your vet examine the area and the sheath, take a swab and check his urine, and mention any new shampoos or grooming products.

See itchy skin in dogs.

This is general information, not a diagnosis. Please follow your own vet's advice.