Update: The little guy is still alive. Since they can't use chemicals for his mite problem, they are giving him warm water soaks with a couple of drops of Dawn to at least knock down the adult mites.
He's feisty, which I hope is a good sign. They said they were actually glad that he bit them twice when soaking him. I think he's just pissed that they started to bury him =P
So far they think they are noticing a slight wobble, but they aren't sure as they are so sensitized to the possibilities. Nothing is overtly horrible for him yet. Fingers crossed.