A definitive diagnosis of sarcoptic mange is often difficult. Several skin scrapes typically are taken and then examined under a microscope. Unfortunately, it is often difficult to detect mites, especially if the animal has had mites for a long time or has had several recent baths or dips.
Other tests can be used to aid in a diagnosis, such as the pinnal-pedal reflex test. This test is given by rubbing the ear margin, or pinna, between the fingers and watching to see if the dog attempts to scratch the ear with its hind leg. If it does, then scabies is the presumptive diagnosis. Generally, if scabies is suspected, treatment should begin immediately. A prompt response to therapy, such as a decrease in itching, generally means the assumption of sarcoptic mange was correct.
