Royal Canin Medium Puppy is suitable for medium dogs with adult weight from 11 to 25kg. From 2 to 12 months old. IMMUNE SYSTEM SUPPORT Growth is an essential stage in your dog’s life: it is the time of big changes, discoveries and new encounters. During this key period, the puppy’s immune system develops gradually. Medium Puppy helps support your puppy’s natural defences thanks particularly to a patented (France, patent No EP1146870) complex of antioxidants including vitamin E.