Adult dogs are pretty fair with puppies.
I know guys who swear by Ol' Roy which is junk by any measurement.
To my mind, you buy the best food you can afford and the one that makes you feel good about what you're feeding your animal. Honestly, Jan, I never go to vets and the rare time I do it's just to get a piece of paper or confirm what I already know. I'd never take their advice about food.