Royal Canin Early Cardiac Dry for Dogs contains nutrients essential for healthy cardiovascular function in dogs with class III heart disease heart murmurs or cardiomegaly without clinical signs with or without concurrent cardiac medications mild signs of congestive heart failure coughing or dyspnea risk for heart disease Appropriate levels of magnesium and potassium Moderate protein content Enhanced B vitamin content Enriched with a special blend of antioxidants to help maintain a healthy immune system and to reduce DNA damage associated with aging Enhanced arginine carnitine and taurine which are essential nutrients for optimal cardiovascular function Moderate rather than severe sodium restriction to reduce the workload on the hearOther products from PetCareRx