Hill's® Prescription Diet® h/d® Canine Heart CareHill's Prescription Diet h d Canine Heart Care This Prescription Diet is sold under veterinary supervision. Please check with your veterinarian if this diet is suitable for your pet before purchase The heart is the most important organ in your pet's body, and factors such as age or weight may affect its function. Poor heart health can affect your dog's life style and happiness. Because the food your dog eats plays an important role in his or her