so in my quest to find whatever it takes for my cat I am in need of some advice.. anyway a little background.. cat is nearly 13 year old neutered male always indoor lover! About 3 years ago it was discovered he had bladder stones and had them removed surgically because noticed his litter box frequency with little to no output. He bounced back from surgery and was placed on one of those lovely prescription foods (Hills I believe) and would not touch the stuff! wasted a lot of money and ended up throwing it out.. now I have 2 other cats indoor one of which was a year and ahalf and the other is around 4.5. My quest then began to find the best food for all to eat.. did a lot of online research and found such conflicting information that I too was confused and after trying many of the high end cat foods including (Wellness, Blue Buffalo, and a few others) I settled on TOTW because all seemed to eat it.. the problem is what I am discovering is that maybe the high protein is not good for my dude.. he is seemingly losing a lot of body mass and feeling skeletal to me again.. (this despite reading numerous articles stating that protein and high protein was good for older cats and even those with kidney issues) I am assuming my boy has the kidney issues attributing back to the bladder stones.. anyway he drinks plenty of water and I do notice that his litter box habits have not really changed ( not straining/ or blood or frequency) he does have outside the litterbox issues once inawhile.. but whatever that is why i have two carpet scrubbers.. I went to pet store today and after looking online settled on a bag of the felidae platinum for elderly and weight managment cats. going to see about him eating this.. I do feed him a multitude of moist cat food and occasionally giv ehim canned tuna and chicken.. this he likes! I also have him on some daily cat vitamin/nutrient paste. any other suggestions for me? outside of his weight issue and possibly age related kidney stuff is there any suggestions to pack some weight on him and or make him more comfortable.. I realize I probably don't have him for too much longer especially if kidneys are in poor shape.. but what now? I should note too that his urine really does not have much odor to it.. the other reason I am leaning toward kidney stuff going on.. going to try the felidae now..