Canadian Brand. 1 out of 3 dogs are overweight. For example, 6 pounds of extra weight on a 60 lb. dog constitutes a 10% increase in body weight. This excess weight can contribute to health problems and a shortened lifespan in large dogs. Royal Canin Large Weight Care is formulated to meet the unique nutritional needs of large breed dogs over 15 months old, between 56 and 100 lbs. with a tendency to gain weight. It satisfies a large dog's appetite while supporting healthy bones and joints.