Frank, two or three years ago, my grandson, as a school project tried to determine which dry dog food was the best; i.e., healthiest for the dogs. I really don't know what he did or how scientific it was, but his conclusion was the IAMS and Science Diet are the best and those two brands are virtually the same thing. Our daughter feeds her Maltese IAMS. When we bought this Chihuahua pup, the lady said she'd been feeding Science Diet, so Science Diet is still what we use.
But there's a slight problem, unfortunately of my own doing. I started giving the dog a bite of whatever I happened to be snacking on, so now she thinks she should have some of whatever we're eating, and she usually gets it, too.

She won't bark, but will just sit there staring at you, and if you ignore her, after awhile, she'll reach with one front paw to touch you on the leg to make sure you do know she's there.