Hills Diet h/d cardiac health canned dog food provides low levels of sodium to help maintain normal blood pressure on aging dogs. It contains a high level of taurine to help support cardiac muscle metabolism. Hills diet h/d cardiac health dog food comes packed with L-carnitine to help with support and provide healthy heart function and with its increased B-vitamins and magnesium, Hills Diet h/d will help replenish lost nutrients when receiving diuretics. Talk to your vet and ask whether Hills Diet h/d cardiac health dog food is right for your aging companion.