Which parasite is commonly called ear mites in dogs and cats?

• A. Otodectes cynotis
• B. Cheyletiella
• C. Demodex canis
• D. Ixodes scapularis

Answer: (A)

The issue here is identifying the parasite that commonly inhabits the ear canal of dogs and cats. Otodectes cynotis lives in the external ear canal, where it feeds on ear debris and irritates the skin, producing intense itching, head shaking, and a characteristic dark cerumen often described as coffee-ground appearance. It is highly contagious between pets through direct contact, which explains outbreaks in households and shelters. Diagnosis is usually made by finding the mites or their eggs on an ear swab under microscope or by observing typical debris during an ear exam. Treatment involves topical acaricides aimed at the ear canal and cleaning to remove debris, plus treating all animals in contact to prevent reinfection. The other organisms listed affect different tissues: Cheyletiella causes skin issues on the body (walking dandruff), Demodex canis causes mange on hair follicles, and Ixodes scapularis is a tick, not a mite or ear parasite.