Diamond Maintenance Formula - 20 lbs. offers a practical dry dog food option for pet parents. Diamond Maintenance Formula is formulated to provide your moderately active dog with the balanced nutrition they need, day after day. Optimal levels of fat and highly digestible protein promote a healthy body condition, with a superior taste your dog will love. Shop Diamond Maintenance Formula - 20 lbs. and other dry dog food options at Uncle Bill's Pet Centers. Uncle Bill's Pet Centers helps Indiana pet parents find trusted pet supplies, food, treats, toys, grooming essentials, and everyday care products for dogs and cats.