My 8 year old Siberian is in the early stages of kidney failure. I’ve done a fair amount of research online and read a lot of labels at my local Petco in an effort to find a good grade commercial kibble with relatively low protein and phosphorus levels. So far Solid Gold Holistique with 18% protein and 0.65 – 0.90% phosphorus looks like my best option. If there are any non-prescription kibbles out there with lower numbers I would very much appreciate hearing about them. Thanks!