Two Pathways to One Claim
AAFCO — the association whose nutrient profiles most US states adopt as the pet food standard — allows manufacturers to substantiate a “complete and balanced” claim in two main ways: by formulating the recipe to meet AAFCO’s nutrient profiles, or by feeding the food to real dogs or cats in an AAFCO-protocol trial. A third “product family” route lets nutritionally similar recipes inherit a tested lead product’s claim. The wording on the bag tells you which path was used.
| Label statement | What it means | What it doesn’t tell you |
|---|---|---|
| “Formulated to meet AAFCO nutrient profiles” | Recipe math and lab analysis meet nutrient minimums and maximums | The food was not necessarily fed to animals |
| “Animal feeding tests using AAFCO procedures” | Dogs or cats ate this food as the sole diet through a defined trial | Trial length and animal numbers are modest |
| “For intermittent or supplemental feeding only” | Not complete — use as a topper or treat | — |
Inside an AAFCO Feeding Trial
An adult maintenance trial starts with at least eight animals, six of which must complete 26 weeks eating only the test food. A veterinarian examines the animals before and after; body weight is tracked, four blood values (hemoglobin, packed cell volume, alkaline phosphatase, and albumin) are measured, and no animal may lose more than 15 percent of its starting weight. Growth trials run a minimum of ten weeks during the most demanding growth phase. If the animals stay healthy, the label may carry the phrase “animal feeding tests using AAFCO procedures.”
What “Formulated to Meet” Really Means
Formulation means the recipe was calculated — on paper and through laboratory analysis — to hit AAFCO’s nutrient minimums and maximums for a stated life stage. It is a recipe check, not a feeding record: it cannot reveal problems with digestibility or with how nutrients interact inside a real gut. Still, formulation is how the vast majority of foods qualify, and a formulated food from a manufacturer with strong quality control is not automatically worse than a trial-tested one. Both statements are considered valid.
The product-family route deserves a brief note, because it quietly covers many recipes. A nutritionally similar food — same processing type, similar calorie density, and matched levels of key nutrients such as protein, calcium, and (for cats) taurine — may inherit the feeding-trial claim of its tested “lead” product without running its own trial. The claim is real under AAFCO rules, but the food on the bag was not itself fed to animals, which is worth knowing before you pay extra for that phrase.
So Which One Should You Pick?
- Treat a feeding-trial statement as a plus — WSAVA guidelines list trials among the positive indicators when evaluating a manufacturer.
- Read the life stage: growth, adult maintenance, gestation/lactation, or all life stages (which must meet the stricter growth profile).
- Weigh the company, not just the claim: employed nutritionists, owned manufacturing plants, published research, and quality-control records.
- Remember the limits: AAFCO sets standards but does not test, inspect, or approve foods — state regulators enforce them, and critics argue both the profiles and the trials could be stricter.
No single phrase makes a food good. A feeding trial shows the recipe works in living animals; formulation shows the math is right. The strongest signal is the manufacturer behind both — one that researches its own diets, checks quality at multiple points, and can tell you exactly how its claim was substantiated.