Treatment of skin diseases, one of the most unsatisfactory and unspectacular of all the branches of veterinary therapeutics, has had scores of suggestions. Only a few of these suggested methods have brought recovery without long periods of treatment which proved a nuisance to both the owner and the practitioner. The etiology of skin diseases can be classified under at least five headings which include nutritional, mechanical, infectious, allergic, and climatic causes and result in correspondingly varied treatments.