Can i have some advice please? My little Misty was limping yesterday. I checked her paws, and I couldn't find anything stuck in them. She didn't mind me touching her paws, so it seemed as though it must be her back legs aching, although it was hard to tell. She limped for a while, then seemed to be walking fine. Later she sort of collapsed onto her side, as if her back legs were hurting. Today she seems fine. I don't know if this would just be like a cramp, because she was sitting hiding nearly all day yesterday, because we were having work done around the house and she's very nervous. She's 7 years old, and I know that when they're older cats sometimes get bad legs, but can this happen when they're younger? Also, she is probably overweight, although the vet didn't mention this when he saw her last month. Could this be the problem? What can I do about it?