Medium-sized dogs are famous for their energy, and were historically working dogs. Whether your medium dog is an indoor companion or spends time hunting outdoors, Royal Canin MEDIUM formulas help these dogs maintain natural defences throughout their life, while providing the balanced energy the medium dog needs to maintain a healthy weight. Supports healthy aging Supports bone & joint health Helps maintain skin and coat health Helps regulate intestinal transit 100% Complete and Balanced Nutrition 100% Satisfaction Guaranteed MEDIUM Aging 10 is for senior medium breed dogs over 10 years old.