Corn could actually be an contreversal ingredient in pet foods, and that is for many reasons. This is because corn contains a higher glycemic level, which could be alright for some dogs but others it could be very harmful. Corn isn’t really considered if its an allergy ridden food or not. This is depending on many facts, such as how much and where it is presented on the ingredient list. Corn could/ and most people say has no biological value. This is also very important because with no biological value, its pretty much useless. And last carbs are not needed by dogs, because their systems run on protein, and fats.
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Information used in this post found on http://www.dogfoodadvisor.com/dog-food-industry-exposed/dog-food-corn/