I know Alto comps are particularly prone to dislocated jaws or he has something stuck deep in his mouth. I've read where other people have been able to put the jaw back in place, but I have no idea how to do this. You could try taking him out and inspect for something stuck in his mouth and if not maybe gently massaging the jaw area to see if it will go back in place. If he can't eat, it would certainly be worth a try.