Pet food maker Blue Buffalo Co. has released diets formulated for dogs and cats suffering from chronic kidney disease. The veterinary-exclusive, grain-free recipes are KM Kidney + Mobility Support for cats and KS Kidney Support for dogs. Close attention was paid to the foods’ phosphorus, protein and sodium levels. “Research has shown that decreased dietary phosphorous helps to limit the progression of kidney disease,” the Wilton, Conn., company stated. Controlling protein and sodium levels can improve kidney function and survival time, respectively, Blue Buffalo added. Both recipes, available in kibble and wet varieties, are part of the Blue Natural Veterinary Diets line, which debuted in 2015. Earlier foods include GI Gastrointestinal Support, HF Hydrolyzed for Food Intolerance and WU Weight Management + Urinary Care. The newest formulas were launched this month at the American Veterinary Medical Association convention in San Antonio. Blue Buffalo isn’t the first pet food manufacturer to offer a renal formula. Kidney support also is available from Royal Canin Veterinary Diet and Hill’s Prescription Diet, for example.