Cheyletiella are mites that live on the skin, causing irritation, dandruff, and itchiness. A distinguishing feature of this mite species are the large, claw-like mouthparts. These mites can be found quite commonly on cats, dogs and rabbits, and other species.
Sarcoptic mange is a highly contagious skin disease found in dogs, caused by the Sarcoptes scabiei mite. These mites will burrow through the skin causing intense itching and irritation. The scratching that results from mange is what causes the majority of the animal's hair to fall out.