Chemical additives used as preservatives. Ethoxyquin is regulated as a pesticide and cannot be added to human food. Many pet foods contain fillers that have little or no nutritional value. Products like feathers, soy, cottonseed hulls, corn cobs, peanut hulls, citrus pulp, screenings, weeds, straw and cereal by-products. Most brands of dog food include some of these by-products and chemical preservatives. The use of low quality products and chemical preservatives may be associated with dry skin, allergic reactions, dental disease, poor health and degenerative organ dysfunction. The average dog (44 Ibs) can consume 26 Ibs of preservatives each year.