Sounds like Nicholas when he was started on the Hill's K/D, his specific gravity was indicating that his kidneys were not concentrating the urine as well as they should. He is the only cat out of the three that does not get fluids. PLEASE PLEASE talk to your vet about the special diets for the kidney cats!!!! To my knowledge, I am not sure that Innova makes a low protein diet for cats. Nicholas has been on the K/D since he was 7, and today at 10(and it is his birthday today!!), he is doing very well. Sometimes, a kidney cat gets an upset tummy. I have given Pepcid(generic is just as good)about 30 minutes before eating and the cat have done just fine. All total, I have had 5 kidney cats, Spunky and Boo passed on in 2004. Boo ate the K/D until the end, she got 100cc of fluids daily, and her blood work looked good. Our vet said it was because of the diet and fluids. Hopefully Cosmo won't need fluids for a few years down the line!!! GOOD LUCK!