Who actually regulates what goes into pet food?
In the United States, two bodies share oversight. The Food and Drug Administration holds authority over pet food safety under the Federal Food, Drug, and Cosmetic Act. The Association of American Feed Control Officials — known as AAFCO — publishes model regulations that most individual states then adopt into law.
AAFCO is not a government agency. It is a voluntary membership organisation of state and federal regulators. Its ingredient definitions and nutritional profiles carry weight because states reference them directly in their feed laws, so a brand that wants national distribution must meet AAFCO's standards as a practical matter.
The European Union operates through a different framework. Regulation EC 767/2009 governs pet food labelling across member states, and the European Food Safety Authority evaluates additive safety. The two systems reach broadly similar conclusions on many additives, but the terminology, category names, and disclosure thresholds differ in ways that matter when comparing labels.
What ingredients form the protein base of most pet food?
Named whole meats — chicken, beef, salmon — appear first on many labels and are weighed before moisture is cooked off. That matters because a cup of raw chicken is mostly water. After processing, a meal listed lower down may actually contribute more protein by dry weight.
Meat meals are the concentrated alternative. Chicken meal, for example, is rendered chicken tissue with most of the water removed. AAFCO's official ingredient definitions specify the minimum protein content and which tissues are permitted in each named meal. These definitions prevent a manufacturer from calling a product 'salmon meal' if it contains mostly non-salmon fish.
Plant proteins — soy flour, pea protein, lentil protein — appear in many formulas, especially grain-inclusive kibble. The FDA has been studying a potential link between legume-heavy diets and dilated cardiomyopathy in dogs since around 2018. As of mid-2026, that investigation has not produced a definitive conclusion, and the agency has not issued a formal prohibition.
How do fats and oils show up on the label?
Animal fats like chicken fat and fish oil supply essential fatty acids and make kibble palatable. AAFCO requires that the source animal be named when the fat comes from a single species. A label that says only 'animal fat' is using a generic term the definition allows for mixed sources.
Plant oils — sunflower, flaxseed, canola — appear more often in formulas targeting specific coat or joint health claims. These claims are regulated separately. The FDA requires that any structure-function claim on a pet food label be truthful and not misleading, though the pre-approval burden is lighter than it is for human dietary supplement claims.
Omega-3 and omega-6 ratios matter in pet nutrition, and some premium brands state these on the guaranteed analysis panel. That panel is mandatory on US pet food and must list minimum crude protein, minimum crude fat, maximum crude fibre, and maximum moisture at a minimum.
What ingredients count as carbohydrates in pet food?
Cats are obligate carnivores, so carbohydrates serve mainly a structural role in dry kibble — they allow the mixture to be extruded into uniform shapes. Common sources include rice, oats, barley, sweet potato, and tapioca. None of these are nutritionally essential for cats the way protein and certain amino acids are.
Dogs are more metabolically flexible and can use carbohydrates for energy. Whole grains provide some fibre and micronutrients alongside starch. The grain-free trend moved many brands toward pea, potato, and lentil bases, which is partly why the FDA legume investigation began.
Fibre sources — beet pulp, chicory root, psyllium husk — appear in smaller quantities. They influence stool quality and, in some formulas, act as prebiotics. Beet pulp is among the more studied options; it is a by-product of sugar beet processing and is defined in AAFCO's ingredient list.
Which additives and preservatives are permitted?
Pet food preservatives keep fats from going rancid and extend shelf life. Mixed tocopherols — the same vitamin E compounds used in some human foods — are common in products marketed as 'natural'. Synthetic options include butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT). Both are permitted by the FDA in pet food at specified limits, and both appear on the FDA's list of substances generally recognised as safe for animal feed use.
Ethoxyquin is a synthetic antioxidant once used widely in pet food, particularly to preserve fish meal. Its use has declined after pet owners raised concerns in the 1990s. The FDA asked manufacturers to voluntarily lower usage levels, and most major brands moved away from it, though it remains technically permitted in fish meal at low concentrations.
Artificial colours are allowed in pet food but serve no nutritional purpose — they are there for the human buyer, since dogs and cats see colour differently from people. Some brands use caramel colour or iron oxide to create a browned appearance. These are listed individually on the ingredient panel.
- Mixed tocopherols — natural vitamin E-based antioxidant
- BHA and BHT — synthetic antioxidants, permitted at FDA-set limits
- Ethoxyquin — synthetic antioxidant, now rare in finished product but may appear in fish meal
- Sodium tripolyphosphate — texture agent in wet food, also a dental care additive in some formulas
- Carrageenan — gelling agent in pâté-style wet food, defined in AAFCO's ingredient list
How do wet, dry, and raw formats change what ingredients appear?
Wet food runs at roughly 75 to 82 percent moisture. That high water content means ingredients like guar gum, carrageenan, and cassia gum do real work holding the texture together. These gelling agents are listed individually and are all defined in AAFCO's ingredient definitions.
Dry kibble needs binders to hold its shape through extrusion. Starch from grains or legumes serves this function naturally. Some formulas add additional binding agents. The extrusion process also affects nutrient availability, which is why most kibble is sprayed with a vitamin and mineral premix after cooking.
Raw and freeze-dried formats skip heat processing almost entirely, which changes the preservation challenge. These products rely on freezing, freeze-drying, or high-pressure processing rather than antioxidants. The FDA requires that commercially sold raw pet food meet the same pathogen safety standards as other pet food, and openFDA enforcement records show that raw pet food has been subject to recalls for Salmonella and Listeria contamination more frequently than cooked formats.
What ingredients must be on the label, and what can be left off?
US pet food labels must carry a product name, net weight, a guaranteed analysis panel, a nutritional adequacy statement, feeding guidelines, and a full ingredient list in descending order by pre-cooking weight. The manufacturer's name and address are also required.
What need not appear is more nuanced. Ingredients that are part of a defined ingredient — such as the individual components of a vitamin premix — do not need to be broken out separately if the premix is listed as a collective ingredient. This is similar to how human food labels handle compound ingredients in some jurisdictions.
AAFCO's nutritional adequacy statement is particularly important. It tells owners whether the food was formulated to meet AAFCO's nutrient profiles for a life stage, or whether it passed a feeding trial. These are two different standards, and the label must specify which one applies. A food that meets the profile on paper has not necessarily been tested in live animals.
How can you read a pet food label more usefully?
Start with the guaranteed analysis and the nutritional adequacy statement before reading the ingredient list. Knowing the protein percentage and the life stage claim sets the context for everything else. Then look at what ingredients occupy the first five positions — those dominate the formula by weight.
Be cautious with ingredient splitting. A brand can list peas, pea protein, and pea flour separately to push each one lower on the list, even though pea-derived ingredients collectively outweigh the named meat. This practice is not prohibited, but it can make a formula look more meat-forward than it is.
If you want to check for specific additives or cross-reference a product against openFDA recall records, InZoRAH can scan the barcode and surface that information in one place. Knowing what ingredients are present is only useful if you can act on the information quickly.
| Requirement | Human Food (FDA/USDA) | Pet Food (FDA/AAFCO) |
|---|---|---|
| Ingredient definitions set by | FDA regulations and GRAS list | AAFCO ingredient definitions (adopted by states) |
| Nutrition facts panel | Mandatory, standardised format | Not required; guaranteed analysis panel instead |
| Life stage claim | Not applicable | Required nutritional adequacy statement |
| Allergen labelling | Major allergens must be declared | No equivalent mandatory allergen declaration |
| Feeding trials | Not applicable | Optional but must be stated if used to support adequacy claim |
| Colour additive approval | FDA colour additive listing | FDA food additive and GRAS provisions apply |
