That is hard to say. Most dogs will do OK on one meal a day after 6 months. Likely it is OK for the little ones too, but the larger breeds are better off to be on adult chow before that. Much of the puppy behavior continues until the personality matures at 3 years. My daughter's Lhasa/Min Pin mix is just 3 now, and still seems about the same. He has learned to live in a house and extended family with Labs and Shepherds. He does his best to keep them straight.
Free feeding works for some dogs, but leads many to life shortening over weight. Your dog definitely should be narrower at the waist than the hips and chest. You should be able to easily feel the ribs, but not see them. Each dog is different. Standard recommendations are a good place to start, but each dog
must have its food adjusted to its individual needs. Here is a good illustrated guide,
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