A histopathological study of common patterns of nonneoplastic skin disease in dog

Since dermatologic cases are among the most common cases to be presented for veterinary clinicians, skin biopsies have become a routine diagnostic procedure for accurate diagnoniss.Based on the reason recognitions of skin lesions is necessary. The purpose of this study was to recognize and determine these patterns and to estimate relative frequency of nonneoplastic skin disease in dogs. 158 skin specimens were collected and have put in 10% buffered formalin. After complete fixation, the specimens were processed through standard paraffin embedding method and were cut for five μm thickness, the samples were stained with Hemotoxylin & Eosin and special stains such as PAS, if necessary. The sections were evaluated histopathologically and their basic patterns were determined. Then the data were analyzed statistically. Results showed all the basic patterns of nonneoplastic skin lesions, however prevascular dermatitis pattern was the most frequent type (33%) and vasculitis pattern was the least (1%).In addition ,patterns including, Interface dermatitis(13%), Nodular&pustular dermatitis(5%), Atrophic dermatosis(23%), Fibrosing dermatitis(7%) and perifolliculitis, folliculitis, frunculosis (13%,) were seen.