Granulomatous dermatitis in carnivores associated with dermatophyte infection

Nine cases of granulomatous dermatitis in carnivores (eight dogs, one cat) are described. In three cases, in which there were no fungi in hair shafts, nor any other evidence of mycotic infection initially, fungal elements were demonstrated in the granulomas with the aid of special stains (PAS and Grocott). Granulomatous dermatitis in case of dermatophyte infections is thought to be an hypersensitivity reaction and has been reported to occur in a variety of mammals. It is suggested that pyogranulomatous skin reactions and trichogranulomas could be associated with dermatophytes and it is recommended to carry out further laboratory studies in order to detect fungi in such cases.