Purina Veterinary Diets have been scientifically formulated and are backed by extensive testing at the Purina Pet Care Center. These high quality diets are authorized for prescription and sale by veterinarians. Purina Veterinary Diets OM Overweight Management brand canine formula biscuits are a low calorie snack and should not be fed as a main meal or a substitute for a complete and balanced substitute for a complete and balanced dog food. These high quality biscuits are part of the OM Canine Formula Weight Management program and are authorized for sale only by veterinarians. This product is intended for intermittent or supplemental feeding only, as part of a veterinary supervised weight loss program. Calorie content calculated Metabolizable Energy (ME): 2735 kcal/kg, 1243 kcal/lb, 27 kcal/biscuit.