Well, I might as well add our practice.
Both the breeder and our vet recommended two meals at first for a young puppy, then shifting to one-a day. Our 10-month old is getting one meal now. The recommended 'dry' food is Natural Balance Potato and Duck (21% protein, 10% fat as Canola, with a raft of supplements and vitamins, and the usual fiber). The taste until recently was improved with a couple of spoons of Science Diet Mix-it, again as suggested by the vet, but he is now weaned off that.
We have an older dog, who receives a quality dry food balanced for adult dogs (similar to "Science-Diet" brands, but cheaper, not the 'MacDonald's for dogs," as Scoville calls them). Iams is recommended by our vet, but a superstore chain here makes a 'President's Choice' that is very good.
Our dogs get an egg once week, when I cook my once-weekly eggs sunny-side up. A little chicken from time to time which they love. Only beef shank bones to chew on.
They get cooked broccoli and asparagus, green beans, etc., the part not eaten by us. Yes, this increases gas volume and potency, but smaller amounts are not harmful. If you have noticed, many dogs get their greens by chomping on grass. After all, the animal is an omnivore.