The guaranteed analysis is four numbers and none of them is the amount in the food. Here is what the panel actually promises.
Every pet food label carries a small block that looks like nutrition information and is not.
Crude protein, minimum. Crude fat, minimum. Crude fiber, maximum. Moisture, maximum.
Read the words attached to the numbers. Two are floors and two are ceilings. A food guaranteeing a minimum of 10% crude protein has promised not to fall below ten. It has promised nothing about what it actually contains, which could be ten or could be considerably more.
The panel is a guarantee, and a guarantee is a boundary.
Not a quality judgment. It refers to the method.
Crude protein is an estimate derived from measuring nitrogen content and applying a conversion factor. The analysis measures nitrogen and infers protein from it.
That is the ordinary analytical method and it works because protein reliably contains nitrogen. What it does not do is distinguish between sources of nitrogen, or say anything about whether the protein is digestible or usable by the animal eating it. Two foods can guarantee the same crude protein minimum and deliver different things.
Moisture is a maximum, and it is the reason two labels cannot be compared as printed.
A canned food at 78% moisture and a dry food at 10% moisture are not on the same scale. The canned food's protein guarantee is a percentage of a product that is mostly water.
To compare them, both have to be converted to a dry matter basis — dividing the nutrient percentage by the dry matter percentage, where dry matter is 100 minus moisture. Only then do the numbers describe the same thing.
Almost nobody standing in a store does this arithmetic, and the label does not do it for them.
Calories are not part of the guaranteed analysis. A calorie content statement is required separately and is expressed in kilocalories per kilogram and per a familiar unit such as a cup or a can.
Vitamins and minerals are not in the guaranteed analysis unless a specific claim is made about them.
Carbohydrate is not listed at all, and there is no requirement to list it. It is generally estimated by subtraction — what is left after protein, fat, fiber, moisture and ash are accounted for.
Not this panel. The nutritional adequacy statement does.
That is the separate sentence identifying which life stage the food is formulated for — growth, maintenance, all life stages — and whether adequacy was established by formulating to an AAFCO nutrient profile or by a feeding trial conducted using AAFCO procedures.
Those are different standards of evidence, and the label says which one was used.
A product that does not claim to be complete and balanced carries a different statement identifying it as intended for supplemental or intermittent feeding. That statement is not a footnote — it is the sentence that tells a reader whether the food is meant to be the whole diet.
1. Product name — the only place a percentage of a named ingredient is implied. 2. Nutritional adequacy statement — complete and balanced, or supplemental. Which life stage. Formulated or feeding trial. 3. Ingredient statement — everything present, descending by weight. 4. Guaranteed analysis — four boundaries, on an as-fed basis. 5. Calorie content — stated separately.
Most people read that list backwards, starting with the numbers because numbers look like the most information. The numbers are the least specific thing on the package.
Panel requirements as set out in the AAFCO model regulations for pet food and specialty pet food. States adopt and enforce these individually and requirements can vary. No brand names are used in this piece by design.