Hill's nutritionists & veterinarians developed Prescription Diet® Metabolic + Mobility Canine clinical nutrition especially formulated to help manage your dog's weight and joint health. In fact, Metabolic + Mobility Canine has clinically proven nutrition to improve mobility in as little as 21 days AND reduce body weight by 13% in 60 days. It naturally works with your pet's unique metabolism and improves your dog's ability to run, walk and jump. This product requires a veterinary prescription. This product requires a veterinary prescription.