Many pet food companies use the cheapest ingredients they can find. Whether it comes from dead diseased animals, road kill, or euthanized pets from shelters. These ingredients are not suitable for human consumption. If you won't eat it, why should your dog! Most pet foods contain 4-D ingredients. 4-D is meat and by-products that have been derived from animals that were rejected by food inspectors who classified the animals as not fit for human consumption because they were “Dead, Dying, Disabled or Diseased” at the time of inspection. Any chemicals that existed within that animal, would still be in it when dead. Meat by-products are nothing more than slaughterhouse waste; waste thats been banned for use in human food and then sold to the pet food industry. It’s what’s left
over after the slaughter and classified as inedible waste, unfit for human consumption.
4-D' s: Road kill, slaughter house rejects, animals that die on their way to meat packing plants - all are acceptable ingredients for pet food under the "4D" rule. Steroids, growth hormones and chemicals used to treat cattle including insecticide patches end up mixed into the final product. Meat from grocery stores past its due date is also added to the mix, as are the Styrofoam trays and plastic wrap they were packed in.
With dry foods, the ingredients are cooked twice. First during rendering and again in the extruder. Problems are much more common than with canned or homemade foods. Altered proteins may contribute to food intolerance's, food allergies, and inflammatory bowel disease.