You are right about the mites, that lead to hair loss. Eventually their skin starts to turn black and they have open sores that bleed. They can get really ugly in the later stages, Im pretty sure once a coyote has it they are eventually going to die from it. They "hole up" in hay stacks or brush piles and don't travel much, they usually grow really long toe nails as a result. They also seem to lose a lot of their fear of human while trying to get warm in the middle of winter with no hair. Earlier this winter I had one come onto my front porch and lay on the door mat. At first he acted pretty sick like he could barely run, until I shot him with the 20 gauge then he came to full life in a hurry and the chase was on. My parents have had them come into their garage trying to eat dog food and stay warm.