Corn was never in a dog’s diet until it became a binder used in manufacturing dry dog food, or kibble. Even though you might see corn listed on a dog food label, dogs can’t digest whole corn kernels, so please don’t offer your dog corn from the table. Corn is ground into a fine meal when used in dog food. Manufacturers include it because corn is a cheap source of calories, less costly than meat protein. Bottom line: When you see corn on the ingredient list, it makes that bag of dog food cheaper, but it’s not doing your dog any nutritional favors.