Check out this article and easy to read charts to see which agencies regulate pet food. Is it the FDA, AAFCO, USDA, or the SDA, or maybe none of them very effectively?

See also how to file a pet food complaint, if you believe your pet has been sickened or died from a commercial pet food. It's important to keep information on the brand, batch number and date for all pet food you purchase, in order to be able to prove that your pet was sickened or died from eating certain food. Many people dump dry food into another container, and toss the bag. Just make a note of the previous details from the bag or cans, so you have the information needed to file a complaint.

Also of importance is to ask your vet to file a complaint on the pet food, and get a copy for your records.