When to stop feeding puppy food?

[tatsxxx11]

My Star is a Lab, which is considered a large but not especially fast growing breed. She was fed puppy formula till age 6 months. For the next 3 months, she was given 1/2 puppy, 1/2 adult formula. From 9 months to 1 yr, 3/4adult, 1/4 puppy. After 1 yr. she was fed only adult. That was what was recommended by the breeder and by my vet, so I stuck with it. Unlike many other large and giant breed dogs, such as Great Danes, St. Bernards, Mastiffs and GSD's, Labs, especially as puppies, are EXTREMELY high energy, maintaining that high energy level well into adulthood and require the extra calories needed to sustain their activity level. Whether this can be achieved by increased amts. of adult food or sticking with the richer puppy formula, I understand is currently up for debate. Star was a puppy 5 years ago, so I'm sure the thinking might be different now. Still, no untoward effects I guess as she topped off at a whopping 55 lbs. She'll be 5 soon and still has that puppy energy and happily, absolutely no joint/hip problems. As with all food changes, whenever you do switch from puppy food, I would do it gradually. At any age, their stomachs can be sensitive to changes