No matter what brand of dog food you choose please read the back. You should pick a dog food that has no animal by-products! If it says "by-products" anywhere on the package get rid of it. There also should not be any corn, it is just a filler and is not doing anything to help your dog, just making him/her poop more.
We feed Victor Hi-Pro Plus with our adult dogs and puppies. We like the small kibble size and it keeps the dogs in great health! We actually order it from chewy.com and have it automatically shipped to our home.