Although you may think all pet food manufacturers have your pet's best interests in mind, this is not always the case. Current pet food regulations allow manufacturers to use ingredients that you would never knowingly give to your pet. In fact, you may be shocked to learn what some brands of pet food really contain. For example: the use of by-products (feet, bones and intestines, etc.), chemical preservatives (BHA and BHT) and grains that are often difficult to digest (corn, wheat, gluten and soy), which are often used as a protein source instead of meat.