Skin mycoses in animals are mostly caused by Microsporum canis, Microsporum persicolor, Microsporum gypseum and in rare cases by Trichophyton mentagrophytes. As a rule only one dermatophyte species is isolated from skin lesions, but at times mixed infection with bacteria occur. In the described case in a cat with typical dermatomycosis, Microsporum canis and Trichophyton mentagrophytes were isolated simultaneously. To the best of our knowledge this is the first case of mixed dermatophyte infection to be descibed in the cat. This paralell infection may suggests, that primary infection of one dermatophyte does not prevent the animal from a secondary infection.