This paper describes the results of treating ten dogs with focal, well-circumscribed skin lesions compatible clinically with seborrheic dermatitis, with oral Vitamin A. All had been fed commercial dog diets and were otherwise healthy. The overall outcome was that three dogs responded rapidly and completely to treatment and seven did not. Those responding had skin biopsy findings consistent with human phrynoderma, a disease thought to be related to vitamin A deficiency. The skin biopsy results for those not responding were not consistent with phrynoderma or follicular keratosis.