About two weeks ago, my kitten was caught under a garage door. His back end was damaged and he was in a lot of pain. We took him to the vet who told us it was touch and go and gave him pain meds and told us to come back in about a week. He seems to be doing better but his hind legs are limited with movement. He hops around like a bunny and his legs are wasting away. Are there any steps I can take to improve his muscle strength? Please help!!