About Renal Dog Food: If your dog has lost their appetite and seems to be drinking more, it may be suffering from kidney problems. The nutritionists and veterinarians at Royal Canin have developed renal dog food in a range of flavours (both wet and dry) to offer your pet to make them more comfortable and give their system a much-needed boost. As well as tasty range, designed to encourage even the fussiest dog to eat, the high-density calorie formula means only a small portion of renal dog food is needed to get results.