I would not turn away a regular customer when requesting routine baths using a vet prescribed benzoyl peroxide shampoo for topical treatment, yet I would have to draw the line if asked to administer to the application of the only effective product licensed for this purpose. Again, this product is best administered by a veterinarian. Check for restrictions in your area prior to stocking and using an insecticide. Sarcoptic is more difficult than demodectic for a vet to diagnose, though easier to treat. Because it is highly contagious to other dogs, I would not hesitate to refuse service to a customer whose dog I suspect or know to be harboring scabies mites.
Ear mites are common to both dogs and cats.
Although this condition is highly contagious, it is usually confined to the ear canal. The signs are characterized by a dark or red-black discharge plugging the ear canal. If ear mites are suspected, recommend the customer seek medical attention in order to obtain an insecticidal ear wash. If the owner is to treat the ear canal with the prescribed medication, the ear canal must be thoroughly cleansed. I accomplish this by filling the ear canal with an ear wash that is designed to loosen all exudates as well as coat the ear canal.