Kidney Failure Diet
Normal dog food can make a kidney-impaired dog even sicker. Your average food is packed with proteins, which break into amino acids, which is responsible for building and replacing tissue cells, and urea, a waste product. In healthy kidneys, urea is filtered out of the blood, but in damaged kidneys, urea builds up in the bloodstream, basically poisoning your pet.
In order to prevent the buildup of harmful products, find a kidney disease compliant dog food. Kidney disease compliant dog food focuses on replacing the nutrients your dog lacks as a result of damaged kidneys, with low percentages of protein, high bio-availability, increased calcium and vitamin D3, and lowered levels of phosphorus.
Above is an excerpt from https://www.vetinfo.com/kidney-failure-symptoms.html
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Many dogs with kidney disease remain on prescription food for the rest of their lives. Along with monitoring, medication, subq fluids (when needed) by a vet. This gives them the best chance.
