Pigmented lesions of the skin.

Abstract Pigmented lesions are common in the dog and cat. They are less common in the horse and pig and infrequently found in laboratory animals and other domestic animals kept for food and fiber production. The true incidence of pigmented lesions in animals is not known. This article is limited to pigmented lesions that arise as spontaneous tumors and tumorlike lesions of the dog and cat. Additional information on melanomas in horses and in swine may be found in other publications. 1,2