Both Demodex mites and Sarcoptes mites can cause mange on dogs. There are three species of mites that can commonly be found on dogs.
Demodex mites can what is known as demodectic mange. Sarcoptes mites cause sarcoptic mange.
Both types of mange can affect the condition of your dog's coat. For example, Sarcoptes mites burrow into your dog's skin. That makes them itch and can make them more prone to infections.
More on homeSarc