My DD started on Iams puppy and went right up the line to the large breed as an adult. He'll be 9 in October and about a year ago I started mixing close to a 50-50 mix of the food they have for older dogs with the large breed. As he gets older I plan on decreasing the large breed until he's strictly on the old stuff. Right now he still has the look and pep of a 5 year old dog.