My 11 yrs old cat after being out for an hour came home and her back legs are unstable. No bites or injuries and she will eat. took her to emergency vet he he can not figure it out. He gave her predisone and an ABS. He said no abnormal feeling in the bones or organs but did no bloodwork or xrays. Just wanted to know your thoughts. Eyes look good. Thanks for any help. Pinknee