Contagious demodicosis in three cats residing in a common household.

Three cats residing in a common household were diagnosed with dermatitis involving infestation by the unnamed species of feline demodectic mite. Food allergy subsequently was diagnosed as the primary cause of the dermatitis in two of the cats which were litter mates. In the unrelated third cat, the mite infestation was the primary cause of the dermatitis and appeared to have been contracted through contact with the other cats.