I tried Iams, Science Diet and a few other choice brands but my Lab only likes the cheap stuff like Kibbles and Gravy Train. I even coated the food with a little gravy, egg or oil. He will actually lick the food instead of eat. But he's a weird dog all around.
We had to be picky with our food because of my ex-wifes Akita. They are supposed to avoid soy based foods.