It’s a frustration that there is so little regulation as to what is allowed in pet foods, and so much regulation preventing better manufacturers from stating that the quality of their ingredients is sound. This means that companies using condemned meats are protected from having to reveal the content, source, or grade of their meats, even though the origins of these meats can be linked to very unethical sources and contain many chemical contaminants.
If you or someone you know is feeding a pet food that contains any of these ingredients: “Animal Fat”, “Meat and Bone Meal”, By-products”, or “Animal Digest”, it is likely that they are using 4D meats (animals that are not allowed to be used for human consumption as they are diseased, disabled, dying, or already dead. These meats are often “denatured”, meaning toxic chemicals are added to prevent them from being allowed back into the human food chain, treated with chemical preservatives to combat rancidity, and contain traces of the drugs used to euthanize the animals, like Pentobarbital (these chemicals do not “cook out”). Heres’ an article from The Truth About Pet Food website that further exposes some of the issues that some grocery store quality foods have.
http://truthaboutpetfood2.com/epa-document-proves-euthanized-dogs-and-cats-are-rendered