To the Editor.—
In his letter in the January 1978 Archives (114:130) Dr Herwick described a case of prurigo in a woman from the San Francisco Bay area that he ascribed to the presence of the canine (and feline) ear mite Otodectes cynotis in the patient's recently acquired dog.
Report of a Case.—
In November 1977 a young dog was referred to me because the owner, a 50-year-old housewife, had been suffering from recurrent, pruritic eruptions on her torso and extremities ever since she acquired the dog some nine months earlier. The dog proved to have a bilateral otitis externa due to a heavy infestation with O cynotis. In brushings from the coat of the animal I found two mites that I first thought to be aberrant ear mites but that were subsequently identified as the canine scurf mite Cheyletiella yasguri. This mite may infest dogs asymptomatically but is quite