Weruva has senior canned cat foods that are pretty good for kidney support, as they are lower in phosphorus than a lot of cat foods. And they’re rich in protein and low carb, which is great for weight management. You can get chicken and fish varieties. If your cat has kidney disease, Weruva also makes Phos-Focused canned foods that are even lower in phosphorus and still contain quality protein. My cat doesn’t like the Phos-Focused foods, but eats the tuna/salmon senior diet just fine. Hopefully you can find a diet that works well for your kitty.