My 2 cents: Knowledge about nutrition changes almost daily, both for humans and dogs. I'm not a big fan of the grain free, high protein diets based soley on the fact that dogs are carnivores. Wild dogs may be primarily carnivores, but their nutritional requirements are vastly different than our pampered pooches. Wild dogs have longer periods of going between feedings, they get more exercise. The body metabolizes proteins, fats and carbs differently in those kinds of cases. You just can't compare that to a dog who is fed at regular intervals and spends most of their day on the couch.
We know from human studies that excluding any group of food has long term negative effects on the body. Nutritional deficiencies build up over time. Supplements aren't as effective as the real thing. Unless their is a medical reason to exclude something (such as all grain-free due to allergies), it doesn't make sense to make a blanket statement such as "corn is bad".
Bottom line, you feed the best food your dog will eat and can tolerate.
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