"Premium" Pet food marketed and sold as "Complete and Balanced" has historically contained such items as Euthanized Dogs and Cats, Restaurant Grease, Hair, Hooves, and Diseased Animals, and other Inedible Garbage.

Because manufacturers need to ensure that dry foods have a long shelf life (typically 12 months) to remain edible through shipping and storage, fats used in pet foods are preserved with either synthetic or "natural" preservatives. Synthetic preservatives include butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT), propyl gallate, propylene glycol (also used as a less-toxic version of automotive antifreeze), and ethoxyquin.

Use of by-products. By-products are ingredients used which are not fit for human consumption. By-products are often floor sweepings from a rendering plant. "Animal by-product" is rendered product from animal tissues, exclusive of any added blood, hair, hoof, horn, hide trimmings, manure, stomach and rumen contents except in such amounts as may occur unavoidably in good processing practices." Pet food labels contain the words "meal" or "byproduct" on the ingredient label. Inedible byproducts such as bone, fat, heads, hair, feet and condemned offal are used in commercial pet food. These materials are sent to a rendering plant for processing into pet food products.

"Meat" is often rendered dogs and cats as well as other animals such as road-kill. When the source of the meat is known it will be listed as beef, poultry, chicken, turkey, etc. If the source of the meat is not known it is simply called "meat.

Rather than the wholesome pictures shown on the pet food packaging, rendering companies dispose of millions pounds of inedible waste each day including, heads, feet,stomachs, intestines, spinal cords, tails, restaurant grease, feathers, bones and dead or diseased animals rejected from slaughterhouses for use in manufacturing pet food. Amazingly, animals from research laboratories may be rendered into pet food as well.

Ol' Roy dog food, which is considered one of the poorest quality dog foods on the market, scored 5 out of 10.

The life span of your pet should be at least 20 years. Your pet's diet strongly influences your pet's life expectancy. Always look for a quality pet food which scores 10 out of 10.