Pet Food Labeling Readiness: Federal Rules and AAFCO Models
Tie every label version to its formula, back each guarantee and adequacy claim with evidence and check the states where you sell.
In Short
- Ingredients by weight, heaviest first.
- AAFCO models vary by state.
- Every claim needs evidence.
US pet food labels sit under two layers. Federal rules in 21 CFR part 501 cover the ingredient list, the manufacturer or distributor name and place of business, net quantity and certain warnings. AAFCO model regulations, which are not federal law but are adopted by many states, shape the product name, guaranteed analysis, nutritional adequacy statement and feeding directions. This guide explains how to prepare label evidence for both; it is orientation, not legal advice. Sources checked 4 Oct 2026.
Federal requirements in 21 CFR 501
Section 501.4 requires ingredients to be listed by common or usual name in descending order of predominance by weight, on the principal display panel or the information panel. Section 501.5 requires the name and place of business of the manufacturer, packer or distributor to appear conspicuously.
More on federal requirements in 21 CFR 501
Section 501.2 says this information belongs on the principal display panel or the adjacent information panel. Section 501.17 covers specific warning statements. Check each label against the current eCFR text rather than a template from an older product.
What AAFCO models add
AAFCO publishes model pet food regulations in its Official Publication. AAFCO itself says these are models, not federal regulations, but many states adopt them and enforce them through feed laws.
More on what AAFCO models add
They cover the product name and the percentage rules attached to words like 'with' or 'dinner', the guaranteed analysis, the nutritional adequacy statement and feeding directions. Because adoption varies by state, record which state requirements you checked for each label and when.
Guaranteed Analysis and Nutritional Adequacy
The basic guaranteed analysis states minimum crude protein and crude fat and maximum crude fiber and moisture. AAFCO describes three standard formats for a complete and balanced claim: formulated to meet an AAFCO nutrient profile, substantiated by animal feeding tests, or nutritionally similar to a product that passed feeding tests.
Nutritional adequacy: which evidence for which claim
| Claim format | Evidence to keep |
|---|---|
| Formulated to meet an AAFCO nutrient profile | Formulation record against the profile, by life stage |
| Animal feeding tests substantiate | Feeding test protocol and results |
| Nutritionally similar to a tested product | Family-product comparison and test results |
| Intermittent or supplemental feeding only | Formulation record and label wording review |
- Formulated to meet an AAFCO nutrient profile
- Evidence to keep
- Formulation record against the profile, by life stage
- Animal feeding tests substantiate
- Evidence to keep
- Feeding test protocol and results
- Nutritionally similar to a tested product
- Evidence to keep
- Family-product comparison and test results
- Intermittent or supplemental feeding only
- Evidence to keep
- Formulation record and label wording review
More on guaranteed Analysis and Nutritional Adequacy
Each claim needs evidence behind it: a formulation record against the nutrient profile, or feeding test results. Products that are not complete and balanced need the appropriate intermittent or supplemental feeding statement.
Keep formula, label and evidence together
Label errors often come from version drift: the formula changes, but the ingredient order, guarantees or adequacy claim on the label do not. Tie each label version to the formula version it describes, the analysis or formulation evidence behind each guarantee, and the person who approved it.
Worked example: label change PL-0412 (chicken recipe v5)
More on keep formula, label and evidence together
When an ingredient supplier or inclusion rate changes, re-check ingredient order and guarantees before new packaging is printed. Keep state registration records with the label version that was registered.
Where V5 fits and where people decide
V5 keeps formula versions, supplier specifications, lab results and label versions linked, with approval history and lot traceability to finished packs. It does not decide whether a claim is supported or which state rules apply.
More on where V5 fits and where people decide
Your regulatory and nutrition people decide the guaranteed analysis, the adequacy statement and whether a label is ready to print. When a complaint or result raises a question about a label, your team decides on investigation and any correction.
Questions
Are AAFCO model regulations federal law?
No. AAFCO describes them as models, not official regulations. Many states adopt them into their feed laws, so check each state where you sell.
What must the guaranteed analysis show?
At minimum, crude protein and crude fat as minimums, and crude fiber and moisture as maximums. Other guarantees apply when claims are made.
How must ingredients be listed?
21 CFR 501.4 requires common or usual names in descending order of predominance by weight on the principal display or information panel.
What supports a complete and balanced claim?
Either formulation to an AAFCO nutrient profile, animal feeding tests using AAFCO procedures, or a qualifying family-product comparison, with evidence kept.
Practical orientation, not legal advice. Rules differ by jurisdiction; your quality and compliance team decides what applies.
Keep reading
Pet Food and Animal Food cGMP Readiness: 21 CFR 507
BSE Feed Rule Readiness: 21 CFR 589.2000 and 589.2001 for Feed and Pet Food
21 CFR 507 Animal Food Guide: CGMP, Food Safety Plan, PCQI and Supply-Chain
Raw Pet Food Pathogen Control: FDA's Salmonella Policy and 21 CFR 507
Salmonella Pet Food Environmental Monitoring Readiness Guide