Puffy is over 10 years old. I recently moved from carpet to hardwood floors, which was an adjustment for jumping. A short time after moving Puffy began hiding all the time, and when she would come out, she seemed to be sort of crouching close to the ground. At first I thought she was still just adjusting to the new place, but I took her to the vet, and it turned out she got fleas during the move, and was allergic. I told the vet about the strange walking, and that I was concerned that she may have also injured herself adjusting to the new floors. He didn't find any injury and said it just seemed a little tight or stiff, maybe arthritis. I contributed this to her being curled up hiding all the time. I treated her for the fleas, and soon she was back to her old social, happy self...except her back legs have still seemed weak. I thought she was getting better, but the last week actually seemed to get worse. I've already made an appointment for the vet, but yesterday, I heard some noise, and thought my other cat was hassling her, and went to break it up. It was just her, sitting on the floor, kicking and kicking, but getting nowhere, she got under the bed, but it seemed like she was still kicking her legs. I thought something had just spooked her, but now am thinking it was more like a spasm, as she did something similar last night, and today with her neck.... These are strictly indoor cats. I'd just like to get as much info as I can before we get to the vet.