Abstract
Information on 2,397 primary skin tumors of domestic animals was reported to the Veterinary Medical Data Program by 12 colleges of veterinary medicine in the United States and Canada. The individual effects of breed, sex, and age on the occurrence of skin tumors were estimated with relative risk techniques. Boxer dogs were at excess risk for skin tumors of hemangioblastic origin; 3 related canine breeds (bulldog, boxer, Boston terrier) were at excess risk for mastocytoma. When all cell types were combined for dogs, no correlation was found between mean annual sunlight and risk for skin tumors, and tumors occurred excessively in females 4–15 years of age when compared with males. Certain high risk categories might be appropriate for laboratory or pedigree studies to identify factors directly related to etiology.

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