In treating Sarcoptes mange in dogs, which topical insecticide is listed as an option?

• A. Ivermectin
• B. Selamectin
• C. Fipronil
• D. Permethrin

Answer: (B)

Selamectin is the topical option used to treat Sarcoptes mange in dogs. It’s applied to the skin and works against mites that infest the surface and hair follicles, making it effective for this condition. As a macrocyclic lactone, it disrupts parasite nerve signaling by opening chloride channels, causing paralysis and death of the mites while being suitable for topical use in dogs.

Other choices don’t fit as well for topical treatment of sarcoptic mange. Ivermectin is typically systemic rather than a topical insecticide, so it isn’t the topical option here. Fipronil targets fleas and ticks and isn’t the standard choice for treating Sarcoptes mites. Permethrin is mainly used for fleas/ticks and is unsafe for cats; it’s not a common or recommended therapy for canine sarcoptic mange.