Demodectic mange is caused by which mite species?

• A. Otodectes cynotis
• B. Sarcoptes scabiei
• C. Cheyletiella
• D. Demodex canis

Answer: (D)

Demodex canis is the mite responsible for demodectic mange in dogs. These tiny mites live in hair follicles and sebaceous glands, and they’re normally kept in check by a healthy immune system. When there’s immune suppression or genetic susceptibility, their numbers can surge, leading inflammation, patchy hair loss, and crusting—ranging from localized spots to generalized dermatitis. Diagnosis is usually by deep skin scrapings or hair plucks that reveal mites within follicles. Treatments aim to reduce the mite population and manage secondary infections. Other common mites cause different conditions: Otodectes cynotis targets the ear canal, Sarcoptes scabiei causes scabies with intense itching and crusting, and Cheyletiella leads to walking dandruff.