Focal loss of pigment in the Belgian Tervuren dog.

Hypopigmentation most commonly affecting the face and mouth of the Belgian Tervuren dog was characterized by an absence of melanocytes in the epidermis. Pigment loss usually occurred during young adulthood, and although there was partial repigmentation in some dogs, complete repigmentation did not occur. Treatment with vitamin and mineral supplements was unrewarding. The condition appeared to have some degree of heritability and to be similar to vitiligo in man.