| Regulatory body (model guidelines) | AAFCO (Association of American Feed Control Officials) |
| Federal oversight agency | U.S. Food and Drug Administration (FDA) |
| Required label elements | 6: product name, net weight, manufacturer info, ingredient list, guaranteed analysis, adequacy statement (AAFCO model pet food regulations) |
| Ingredient list ordering rule | Descending order by pre-cooking weight |
| Life stages recognized by AAFCO | Growth, adult maintenance, all life stages, senior (informational only) |
| Guaranteed analysis nutrients | Crude protein (min), crude fat (min), crude fiber (max), moisture (max) |
What the Law Requires on Every Pet Food Label
Pet food sold in the United States is regulated at both the federal level (by the FDA) and, more practically, through model regulations developed by the AAFCO — a nonprofit body whose guidelines most states adopt into law. That means every bag or can you pick up must, by regulation, display six core elements: the product name, net weight, manufacturer's name and address, a list of ingredients, a guaranteed analysis, and a nutritional adequacy statement.
Understanding those six pieces is the foundation of label literacy. For a deeper look at how nutritional terms translate to your specific pet's diet, see the full breakdown of pet food nutrition labels in our Animal Health hub.
| Regulatory body (model guidelines) | AAFCO (Association of American Feed Control Officials) |
| Federal oversight agency | U.S. Food and Drug Administration (FDA) |
| Required label elements | 6: product name, net weight, manufacturer info, ingredient list, guaranteed analysis, adequacy statement (AAFCO model pet food regulations) |
| Ingredient list ordering rule | Descending order by pre-cooking weight |
| Life stages recognized by AAFCO | Growth, adult maintenance, all life stages, senior (informational only) |
| Guaranteed analysis nutrients | Crude protein (min), crude fat (min), crude fiber (max), moisture (max) |
How the Ingredient List Actually Works
Ingredients are listed in descending order by pre-cooking weight — meaning whatever appears first was the heaviest ingredient before processing. A food that lists "chicken" first contained more raw chicken by weight than any other single ingredient at that point. This is the same ordering principle used on human food labels, as explained in our guide to reading an ingredient list without a chemistry degree.
Two nuances matter here. First, moisture weight is included — raw chicken is about 75% water, so after cooking it shrinks considerably. A dry food that leads with "chicken" followed by several grain ingredients may contain more grain protein by dry weight than chicken. Second, manufacturers sometimes use a practice called ingredient splitting: listing related ingredients separately (e.g., "ground corn," "corn gluten meal," "corn bran") so each appears lower on the list individually, even though combined they outweigh the first ingredient. Neither practice is illegal, but knowing about them helps you read more critically.
AAFCO
The Association of American Feed Control Officials. A nonprofit organization that establishes model regulations and nutrient profiles for pet food, which most U.S. states adopt into law.
Guaranteed Analysis
A mandatory label panel showing minimum or maximum percentages of key nutrients — crude protein, crude fat, crude fiber, and moisture. These are regulatory floors or ceilings, not exact nutrient values.
Dry Matter Basis
A calculation method that removes moisture content from nutrient percentages, enabling fair nutritional comparisons between wet and dry pet foods.
Ingredient Splitting
The practice of listing multiple forms of the same ingredient separately (e.g., corn flour, corn gluten meal) so each appears lower on the ingredient list individually, even though combined they may outweigh the leading ingredient.
Nutritional Adequacy Statement
A required label sentence stating whether the food is complete and balanced for a specific life stage, and whether that claim is supported by AAFCO nutrient profiles or an actual feeding trial.
Feeding Trial
A regulated testing method in which a pet food is fed to live animals over a defined period. Foods that pass earn an AAFCO feeding trial claim on their adequacy statement, indicating observed real-world palatability and tolerability.
The Guaranteed Analysis: What Those Percentages Mean
The guaranteed analysis (GA) lists minimum or maximum percentages for four nutrients: crude protein (minimum), crude fat (minimum), crude fiber (maximum), and moisture (maximum). Crude refers to the chemical method used to measure — not a quality judgment. These are guarantees of a floor or ceiling, not exact values, so the actual nutrient content may differ.
Because wet food can be 75–82% moisture and dry food around 10%, direct GA comparisons between formats aren't meaningful without converting to a dry matter basis — a calculation that removes moisture from the equation. Divide the nutrient percentage by (100 minus moisture percentage), then multiply by 100. For a practical side-by-side comparison of wet and dry food nutritional profiles, see our article on wet food vs. dry food.
75–82%
Typical moisture content in wet pet food
High moisture content means wet and dry food guaranteed analysis figures cannot be compared directly without a dry matter basis conversion.
~10%
Typical moisture content in dry pet food
The large moisture gap between formats is why the same protein percentage on each label represents very different actual nutrient densities.
~75%
Water content of raw chicken
Because pre-cooking weight is used for ingredient ordering, moisture-heavy ingredients like raw meat rank higher on the list than their post-processing contribution may suggest.
Nutritional Adequacy Statements and Feeding Trials
The nutritional adequacy statement — sometimes called the AAFCO statement — tells you whether a food is intended as a complete diet or only a supplement, and which life stage it's formulated for (growth, adult maintenance, all life stages, or senior). This single sentence is arguably the most important line on the label.
A food can earn this statement in one of two ways: by meeting AAFCO nutrient profiles through calculation (a laboratory-based method), or by passing an AAFCO feeding trial — where the food is actually fed to animals for a set period and health outcomes are monitored. Both methods are legitimate, but feeding trials provide direct, observed evidence of how real animals respond to the diet.
Unregulated Marketing Terms to Watch For
Words like "premium," "natural," "holistic," and "human-grade" have no standardized legal definition under AAFCO or FDA rules for pet food. "Natural" has a partial AAFCO guideline (generally meaning no synthetic ingredients), but enforcement is inconsistent and the term does not indicate superior nutrition. Treat these words as marketing, not as nutritional claims.
Marketing language such as "premium," "natural," or "holistic" has no regulated definition in pet food and tells you nothing about nutritional quality. For a wider look at how packaging claims are crafted, see our piece on what packaging claims actually mean.
Once you're comfortable with the label, remember that label quality is only part of the picture — portion size shapes your pet's health just as meaningfully as ingredient choices.