Wilson's had issues off and on with limping with his rear leg it's never been anything serious. The last time he was limping pretty good and I had noticed that he wouldn't hop on his favorite chair. Turned out he had a pulled groin and meds helped him quite a bit. There was another time though when he was limping and a check of his paw pad revealed a pretty deep cut. Keep an eye on him and if he's still limping in a week take him to the vet to be checked just to be safe.