Her kidneys were tested in September when she was in the vets for a day with a nasty tummy bug, and they were fine. me and the vet were surprised as she is on pills for thyroid and also Semintra for her kidneys as results were high in the past. I will keep her on the Loxicam I think, as she is doing well on it, but our other oldish cat Moses is 18 is also arthritic, so we will try him on the Cosequin. he howls quite a lot, although he is quite deaf now, but we know he has bone spurs on his back from a RTA when we first had him 17 years ago.