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 defenses throughout their life while providing the balanced energy the medium dog needs to maintain a healthy weight. What's in the box 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 defenses throughout their life while providing the balanced energy the medium dog needs to maintain a healthy weight.