Association of American Feed Control Officials (AAFCO)
The dog food industry wants you to think that there is a group checking on the nutritional value in dog food, but that is not true. Dog food bags and commercials want you to think that The Association of American Feed Control Officials (AAFCO) is the guardian of health, but they were formed (in their own words) to "aid in the production, labeling, distribution, or sale of animal feeds." They are an industry group dedicated to commerce and formed to proactively control the government watchdogs.

AAFCO promotes selling animal feed and they are not experts on nutrition. They are expert at controlling the government.
What is particularly disturbing is that the law does not protect the food we feed our dogs. In fact, while food for human consumption must go through an inspection process, there is no inspection process on pet food ingredients that are used. Sources known as 4-D are used in a variety of pet foods, except in only a few states. What are 4-D sources? 4-D sources are animal tissues, which are retrieved from diseased, disabled, dying, or dead animals at a slaughterhouse.

What is just as disturbing is the use of chemicals within the pet foods. When meats have been rendered not for human consumption, it is required by law to undergo a procedure known as denatured. This is the process of saturating the meat with chemicals such as citronella, carbolic acid, kerosene, oil, or fuel, to ensure the meat will not be used for humans. Instead, this food ends up within the foods we feed our pets, as well as other foods that the USDA has rejected, such as rancid animal fats or moldy grains.

If you read up on your dog food information, you will find that the main ingredient in commercialized animal food is by-products. Meat by-products is a combination of contaminated and diseased meats. These meats typically come from the beaks, feet, feathers, toenails, and heads of animals, as well as slaughterhouses. If that was not disturbing enough for you, these meats can also come directly from animals that have been euthanized in shelters or animal hospitals, as well as rancid grease from restaurants and animals that have been collected dead from the roadside.

That is enough to make any dog lover cringe in disgust. There is more though, think about any drugs used on the animal being euthanized, that is contained within the pet food as well. The content also contains anything that may have been on the animal or packaged with the meat. For example, flea collars, plastic or Styrofoam packaging used for meats left unsold at the supermarket, and other such things.