The point at when you change over from puppy to adult food is a personal choice. General advice is
to begin to make the change once your puppy is around three-quarters expected adult size and
many people choose to do so at some point between 9 and 18 months. 

The main difference between our puppy and adult varieties is that puppy contains higher levels of protein to assist with the high growth rate associated with that life stage. Our adult varieties are suitable to feed from the age of 8 weeks, although when feeding an adult variety to a growing puppy we do advise that you feed according to your puppy's appetite. This ensures they grow at the correct rate and consume enough nutrients to support this.