AAFCO stands for the Association of American Feed Control Officials, and it’s the organization that sets the nutritional standards nearly all commercial dog food in the United States must follow. AAFCO itself doesn’t approve, certify, or test any pet food. Instead, it creates model regulations that individual states adopt into law, making it the de facto rulebook for what goes into your dog’s bowl.
What AAFCO Actually Does
AAFCO is a voluntary membership association made up of state and federal regulatory officials responsible for enforcing animal food laws in their jurisdictions. Its core job is developing standardized definitions, nutrient profiles, and labeling guidelines so that pet food rules are consistent from state to state. The majority of U.S. states have adopted some version of the AAFCO Model Pet Food Regulations into their own laws. As a practical matter, any company selling dog food in multiple states needs to meet AAFCO’s standards, because those standards are baked into state-level enforcement.
The FDA also plays a role. The federal agency has historically provided scientific and technical expertise to AAFCO, particularly when reviewing new ingredient definitions. But the FDA generally defers to the AAFCO framework for ingredient standards and nutritional adequacy rather than creating a parallel system.
AAFCO Nutrient Profiles for Dogs
AAFCO publishes detailed nutrient profiles that specify minimum (and in some cases maximum) levels of nutrients dog food must contain. These profiles are organized into two life-stage categories: “growth and reproduction,” which covers puppies and pregnant or nursing dogs, and “adult maintenance,” which covers fully grown dogs. When a label says “for all life stages,” the food meets the more demanding growth and reproduction profile.
The profiles cover a wide range of nutrients across several categories. Protein requirements include not just total crude protein but specific amino acids like arginine, lysine, and methionine. Fat requirements address crude fat along with essential fatty acids like linoleic acid and alpha-linolenic acid. Mineral standards set levels for calcium, phosphorus, potassium, sodium, iron, zinc, iodine, and others. Vitamin requirements span vitamin A, vitamin D, vitamin E, thiamine, choline, and more. For certain minerals and vitamins, AAFCO sets maximum limits too, because oversupplementation can be just as harmful as deficiency.
“Complete and Balanced” on the Label
The phrase “complete and balanced” is the single most important thing to look for on a dog food package. It means the food contains every nutrient your dog needs, at the right levels, to serve as a sole diet. A product can only carry this claim if it meets one of two AAFCO requirements: the food’s formula matches every nutrient in the relevant AAFCO profile, or the food has passed an AAFCO feeding trial.
Products that don’t meet full nutritional adequacy standards must say so. You’ll see language like “for intermittent or supplemental feeding only,” which means the food isn’t designed to be your dog’s entire diet. Treats, toppers, and some specialty foods fall into this category.
Formulated vs. Feeding-Trial Tested
When you flip a bag of dog food over, the nutritional adequacy statement will use one of three specific phrases. Understanding the differences helps you evaluate what level of testing went into the product.
- “Formulated to meet the nutritional levels established by the AAFCO Dog Food Nutrient Profiles” means the manufacturer designed the recipe on paper (or through lab analysis) to hit every required nutrient level. The food was never fed to actual dogs as part of a formal trial.
- “Animal feeding tests using AAFCO procedures substantiate that [product] provides complete and balanced nutrition” means the food was actually fed to real dogs under controlled conditions, and those dogs stayed healthy on it.
- “Provides complete and balanced nutrition… and is comparable to a product which has been substantiated using AAFCO feeding tests” means a closely related product in the same product family passed a feeding trial, and this formula is similar enough to ride on those results.
How AAFCO Feeding Trials Work
For an adult maintenance claim, the trial requires a minimum of eight healthy dogs, all at least one year old and at a healthy weight, to eat nothing but the test food for 26 weeks (about six months). A separate control group of eight dogs eats a known adequate diet for comparison. Dogs are weighed weekly, examined by a veterinarian at the start and end of the trial, and have blood work checked at the end, including hemoglobin, packed cell volume, and markers of organ and protein status.
Growth claims require a minimum of eight puppies from at least three different mothers. The trial is shorter, running at least 10 weeks, with the same structure of weekly weigh-ins, vet exams, and blood work. Any animal that dies during either type of trial must be necropsied to determine the cause.
Feeding trials are more expensive and time-consuming for manufacturers, which is why many brands opt for the formulation method instead. A food that passes a feeding trial offers slightly more real-world assurance that dogs can thrive on it, since a formula that looks perfect on paper can still have digestibility or bioavailability issues that only show up when dogs actually eat it.
“AAFCO Approved” Is Not a Real Thing
One of the most common misunderstandings is that AAFCO approves or certifies dog food brands. It doesn’t. AAFCO writes the rules; state feed control officials enforce them. No dog food is “AAFCO approved,” and any brand using that phrase is misleading you. What you should look for is the nutritional adequacy statement, which will reference AAFCO nutrient profiles or AAFCO feeding procedures in one of the three standard formats described above.
Label Changes Coming Soon
AAFCO has adopted a set of label modernization changes that will roll out over the next several years. The biggest update is a new Nutrition Facts box designed to look more like what you see on human food packaging. Calorie information will be stated using common household measurements rather than obscure per-kilogram figures. Total carbohydrate and dietary fiber guarantees will replace the old crude fiber guarantee, giving you a clearer picture of what’s in the food. Ingredient statements are also being updated to use clearer common names. AAFCO has recommended a six-year transition period, so you’ll see the new labels appear gradually, with all packaging expected to comply by the end of that window.