The initial ingredient in your dog's food is highly recommended a specified meat. Not really a meat by-product, but the true thing. Puppies and adult dogs weren't meant to eat corn and wheat. Read this http://www.petspinboard.com/best-dog-food-skin-allergies/
. If the original ingredient in your dog food is really a corn, wheat, meat by-product, bone meal or anything but a real specified kind of meat, steer clear. By-products will be the leftovers, just like the eyes, hooves, skin, feathers and feet, that aren't advantageous to human consumption.