RESUMEN
Studying the pathogenicity of Pityrosporum canis as the causative agent of otomycosis in dogs, 20 dogs were divided into 4 groups, each contained 5 dogs. Dogs of the 4 groups were inoculated experimentally with Pityrosporum canis in the first group after trauma, in the second after foreign body induction, in the third after long duration of antibiotic therapy, while the fourth group was left as control. It was found that 8 dogs from 15 experimentally infected dogs in the first three groups took the infection and the fungus could be isolated from 3 dogs in the first group and from 5 dogs in both second and third groups, while the fourth group gave no response. Topical application of clotrimazole for the treatment of otomycosis in dogs was very effective without any side effect and no signs of inflammatory reactions could be observed