How to Read a Dog Food Label: What Actually Matters

AAFCO, the association that sets pet food model rules, calls this statement the key to meeting your pet's needs. It is usually small print on the back or side of the package⁴. A food that says it is “complete and balanced” is meant to be a dog's sole diet. Treats, snacks, and supplements usually are not².

The statement is supported in one of two main ways¹:

• Formulated to meet the AAFCO Dog Food Nutrient Profiles for a life stage. This is a nutrient-level standard.
• Animal feeding tests using AAFCO procedures substantiate the claim. The food was actually fed to dogs.

A third, rarely used format says a food is comparable to one that passed feeding tests¹. AAFCO states there is no “AAFCO-approved” pet food³, and seals or endorsements from other groups do not guarantee adequacy either².

The recognized life stages are gestation/lactation, growth, maintenance, and all life stages¹. Active, growing, or nursing dogs may need different nutrient amounts than a sedentary adult, and calorie-rich growth foods can lead to weight gain in less active adults⁴. A food labeled for “all life stages” should give separate feeding directions for each stage⁴. For a puppy, a senior, or a dog with a medical condition, ask your veterinarian which type fits.

Foods that are not complete and balanced usually carry wording such as “for intermittent or supplemental feeding only” instead of a life-stage claim⁴. Some veterinary diets are meant to be fed only as directed by your veterinarian¹. If a bag has no adequacy statement and is not clearly labeled as a treat or supplement, that is a reason to ask questions before buying it.

Ingredients must be listed in descending order by weight, and absolute amounts are not shown¹. That tells you the order but not how much of anything is in the bag. A veterinary nutritionist at Tufts advises against choosing a food mainly from its ingredient list, because the manufacturer's nutrition expertise and quality control matter more⁵.

The guaranteed analysis must list four things: minimum crude protein, minimum crude fat, maximum crude fiber, and maximum moisture¹. These are “as fed” numbers that include water. AAFCO nutrient profiles use dry matter, so comparing a canned food with a dry food takes a conversion: divide the nutrient percentage by the dry matter percentage (100 minus moisture), then multiply by 100². For example, 12% protein in a food that is 78% moisture is about 54.5% protein on a dry matter basis². The guaranteed analysis is a minimum or maximum, not a measure of quality.

AAFCO says “natural” terms are “not expressions of safety,” and that products claiming to be all-natural must meet certain guidelines³. The FDA does not generally review pet foods before they are sold. The law requires that they be truthfully labeled⁶.

“Grain-free” tells you what is left out, not whether the diet is better. The FDA investigated reports of dilated cardiomyopathy (DCM), a heart disease, in dogs eating many foods labeled grain-free. More than 90% of the reported products were grain-free and 93% contained peas or lentils. The FDA has not established a cause, notes that most dogs eating these foods did not develop DCM, and stopped regular updates in December 2022⁷. If your dog eats a grain-free diet, talk with your veterinarian rather than switching on your own⁷.

Directions must state at least how much to feed per unit of body weight over a period of time¹. AAFCO says they are only guidelines, and you should adjust the amount if your dog is gaining or losing weight⁴. Treats are fed in addition to a complete diet, so count them too⁴. Your veterinarian can help you check body condition and set a target amount.

Much of what the World Small Animal Veterinary Association (WSAVA) recommends checking, such as a manufacturer's nutritional expertise and where foods are made, is not on the label. Owners usually must contact the company⁵⁸. Call your veterinarian before changing diets, and promptly if your dog shows low energy, coughing, trouble breathing, or collapse⁷. Share a full diet history, including treats.

A quick checklist for the shelf:

1. Find the adequacy statement and confirm it names your dog's life stage.
2. Note whether it says “formulated to meet” or “feeding tests,” and ask the company about its nutrition expertise.
3. Use the ingredient list to check for known allergens, not to rank quality.
4. Convert to dry matter if you are comparing wet and dry foods.
5. Start with the feeding directions, then adjust to your dog's weight and body condition.