Which species of mite is responsible for 'walking dandruff' in dogs?

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

Answer: (B)

Walking dandruff in dogs is caused by Cheyletiella mites, fur mites that live on the surface of the skin and in the coat. Because they inhabit the skin’s surface, the flakes and even the mites can be seen moving through the fur when the coat is brushed or combed, giving the appearance that the dandruff is walking. This moving scale sign is what makes the condition distinctive.

Other mites cause different problems: Demodex mites live in hair follicles and typically produce hair loss and generalized dermatitis rather than visible moving dandruff; Sarcoptes scabiei causes intense itching and crusting mange; Otodectes cynotis lives in the ear canal and causes ear infections. Cheyletiella infestations are usually superficial and contagious, with potential zoonotic itch in people. Diagnosis is often by directly observing the moving mites on the coat or via skin scrapings or a tape test, and treatment involves veterinary-prescribed acaricides and cleaning the environment, plus treating all affected animals.