My big-eyed (Amani Forest) tree frog, Michigan, has been acting very wierd lately. He's perched himself on a piece of cork bark in his cage, and he is up on all fours like he is doing a push up. His body seems unusually round (it wasn't like that a couple of hours ago) and he keeps opening his mouth like he can't breathe. He also keeps using his front feet to wipe away some slime around his mouth, which then gets stuck to his feet so that he can't put them all the way down. He also seems fidgety or uncomfortable, and shrunk back when I opened his cage, which is very unusual. What could be wrong with the little guy?