Low - quality dog foods often list filler ingredients like corn or wheat first — these materials are called fillers because they are used to bulk up the product without adding significant nutritional value. (dogfoodinsider.com)
While vegetables offer significant nutritional value, I don't recommend feeding strictly vegetarian diets to dogs. (animalkindvet.com)
I'd argue that if you're going to eat carbs (and you do need some in your diet), you might as well eat those with significant nutritional value as opposed to those with empty calories. (diabeticfoodie.com)