http://www.petfood.aafco.org/
From the front page: AAFCO does not regulate, test, approve or certify pet foods in any way.
AAFCO establishes the nutritional standards for complete and balanced pet foods, and it is the pet food company's responsibility to formulate their products according to the appropriate AAFCO standard.
(Bold was used by the AAFCO website)
http://www.fda.gov/ICECI/ComplianceM.../ucm074712.htm
*CVM is aware of the sale of dead, dying, disabled, or diseased (4-D) animals to salvagers for use as animal food. Meat from these carcasses is boned and the meat is packaged or frozen without heat processing. The raw, frozen meat is shipped for use by several industries, including pet food manufacturers, zoos, greyhound kennels, and mink ranches. This meat may present a potential health hazard to the animals that consume it and to the people who handle it.*
(Bold is mine)
http://www.fda.gov/ICECI/ComplianceM.../ucm074710.htm
Pet food consisting of material from diseased animals or animals which have died otherwise than by slaughter, which is in violation of 402(a)(5) will not ordinarily be actionable, if it is not otherwise in violation of the law. It will be considered fit for animal consumption.
(Bold is mine)
http://www.fda.gov/AnimalVeterinary/.../ucm047120.htm
Dog and cat foods labeled as "complete and balanced" must meet standards established by the Association of American Feed Control Officials (AAFCO) either by meeting a nutrient profile or by passing a feeding trial.









I like the upbeat part where we talk about what's good for our kitties. 

