Hi, a good age to switch from Puppy Food to an adult formula is around 6 or 7 months old. It's best to leave your puppy on puppy food until this age because puppy food has the extra calories, vitamins and minerals needed for the rapid growth and development of a puppy. Since you are feeding Fromm's puppy, then you can switch over to the adult formula without having to do a slow transition. Fromm's foods are good for all stages, and the flavours are interchangeable. We switched our two guys to Fromm's Beef Frittata when they were 7 months old, and we also reduced the amount of food they were getting by eliminating the afternoon feeding at this time as well. When they were puppies, we fed them 1 cup three times a day, and then at 7 months, we went to 1 cup two times a day.