When we first got Rocky (almost 14 years ago) we took him to a new vet, who was recommended to us by our neighbours, that gave us a whole "puppy care" booklet, including foods the vet would recommend. It was nearly laughable: pro plan, pedigree, science diet and a few other not so great foods. Ya, no thanks. Other than that, none of the other vets have ever tried to push any foods on us. Besides the first vet, all the others have basically said "if it's working for your dog then keep doing what you're doing."