What the pet food label does not tell you

A pet food label is a legally regulated panel, but legal is not the same as transparent. A compliant ingredient list and guaranteed analysis can be entirely accurate and still leave a careful owner with the wrong impression of what is in the bag. The gaps are not usually lies: they are the predictable result of rules that let manufacturers report figures in a particular way. Once you know where those gaps sit, the same label tells a much fuller story. This article walks through four of them, each drawn from how labels are actually written under Regulation (EC) No 767/2009 in the EU and the AAFCO guaranteed-analysis convention in the US.

Petipedia · Editorial team

General documentary information. For an individual animal, a veterinarian's advice takes precedence over any online content.

Gap one: the order of ingredients is decided before the water leaves

Ingredients are listed by weight, but that weighing happens as-fed, before processing. Fresh meat is roughly 70 percent water (FEDIAF, 2019), and after extrusion the finished kibble holds only about 8 to 10 percent moisture. So a fresh chicken listed first can lose most of its mass during cooking and end up contributing less to the finished food than a "lower" ingredient that arrived dry. The same 30 percent declared as dehydrated chicken would correspond to a much higher protein share than 30 percent fresh chicken once both are measured in the bag (AAFCO, 2024).

The practical consequence is that the first ingredient is not automatically the dominant one in the food you pour out. A dry meal or protein concentrate sitting second or third can outweigh a glamorous fresh-meat headline once water is accounted for.

Gap two: ingredient splitting can bury a major component

Splitting is the practice of dividing one ingredient into several fractions so each lands lower on the list. Three fractions of the same plant, for example pea protein, pea starch and pea fibre, are each counted separately and each weighs less than the headline meat, yet added together they can outweigh it (Tufts Petfoodology, 2021). Nothing here is illegal. The label is accurate fraction by fraction. The misleading impression is an emergent property of an accurate list.

The defence is to read the whole list, not the top three lines, and to mentally recombine fractions that share a botanical origin. If peas appear three times in different costumes, treat them as one large entry.

Gap three: the biggest component of many kibbles never appears at all

Carbohydrate is the major nutrient that the guaranteed analysis is not required to state. The panel reports crude protein, crude fat, crude fibre, moisture and crude ash, and from those you can recover carbohydrate only by subtraction. The nitrogen-free extract, the by-difference carbohydrate, can make up more than 40 percent of a kibble's dry matter, a major item yet invisible on the label (Tufts Petfoodology, 2021). An owner scanning for carbohydrate content will not find a line for it, which is exactly why the figure feels low when it is often the largest single fraction.

You can estimate it yourself. On a dry-matter basis, carbohydrate is what remains after protein, fat, fibre, moisture and ash are subtracted from 100. It is an estimate, not a guarantee, and because it absorbs every imprecision in the other assays it can overstate digestible carbohydrate by folding in soluble fibre (Tufts Petfoodology, 2021). Even so, an estimate beats a blank.

Gap four: crude ash sounds bad and usually is not

Crude ash is the mineral residue left after combustion, a measure of total mineral content. Owners often read a higher figure as a sign of low quality, which is backwards for meat-rich foods. A kibble very rich in meat and bone can show ash around 8 to 9 percent with no quality flaw, through the natural supply of bone, while an artificially low figure is not a mark of superiority (FEDIAF, 2019). What matters more than the headline ash number is the calcium-to-phosphorus ratio behind it, which is decisive for the growth of large-breed puppies and for renal function (NRC, 2006).

Gap five: "open" declarations hide which species you are feeding

The FEDIAF labelling code permits two ways of declaring ingredients: by generic category, called an open declaration, or by specific name, called a closed declaration (FEDIAF, 2019), and AAFCO follows comparable conventions in the US. An open declaration lets a maker write "meat and animal derivatives" or "cereals" instead of naming the species and grain, which gives recipe flexibility at the cost of precision (FEDIAF, 2019). For most owners that is a minor concern. For an owner managing a suspected food sensitivity it is decisive: a closed declaration, species by species and material by material, is clearly preferable, because you cannot avoid an ingredient a label refuses to name (WSAVA, 2021). A bag that will not tell you which animal the protein came from is not a bag you can run an elimination diet around.

Fresh meat versus meat meal: neither wins by default

Labels invite a second false hierarchy between "fresh" meat and the dried form, also called meal. The dehydrated form is cooked, pressed and dried material reduced to a concentrated powder, while fresh meat is added raw and soaked with water (AAFCO, 2024). Marketing has trained owners to prefer the word fresh, but neither fresh nor dehydrated is inherently better: quality depends on the raw material and the process (FEDIAF, 2019). In fact, because the meal arrives with its water already removed, it can contribute more protein by dry weight than a fresh ingredient ranked above it, which loops straight back to the water problem in gap one. The honest reading judges the food as a whole rather than any single cue, which is exactly what the WSAVA recommends (WSAVA, 2021).

What the guaranteed analysis can and cannot promise

It helps to be clear about what the constituents panel is even for. The guaranteed analysis, or the EU analytical constituents, shows guaranteed bounds, usually crude protein, crude fat, crude fibre, crude ash and sometimes moisture (AAFCO, 2024). These bounds protect the buyer against gross misdescription, but they fix neither a precise level nor, crucially, the quality behind it: they measure neither digestibility nor material quality (AAFCO, 2024). Two foods can post an identical crude protein figure while delivering very different amounts of usable protein, because one uses a highly digestible animal source and the other a poorly digestible one. The panel tells you how much protein is present, not how much your pet can actually absorb. That second question, digestibility, is invisible on the label entirely, which is among the strongest reasons to weigh the maker's expertise rather than the printed percentages alone.

A worked reading of one panel

Here is how the four gaps combine on a single hypothetical kibble.

Read in isolation, this label flatters the food. Read with the gaps in mind, it describes a meat-and-pulse kibble with a substantial carbohydrate fraction and a normal mineral load, which is a perfectly reasonable product, just not the one the front-of-pack story implies.

Alt text: "Annotated mock pet food label with callouts marking ingredient order, the absent carbohydrate figure, and the crude ash percentage."

What a "with chicken" claim is, and is not, promising

The front-of-pack protein claim is governed by rules that bear little resemblance to what shoppers assume. Naming conventions allow very different inclusion levels depending on the exact wording, so a food called "chicken dinner", one called "with chicken", and one "chicken flavour" can contain markedly different amounts of chicken, descending sharply as the phrasing softens. A bare "with chicken" can rest on a small inclusion, which is why a clearly stated higher percentage is a better signal than a vague descriptor, without ever being proof of quality on its own (WSAVA, 2021). The same caution applies to ingredient order: order is a starting clue, but concentration, not rank, sets the real contribution (AAFCO, 2024). Read together, these two points mean the front of the bag is a marketing surface governed by naming rules, while the substance lives in the full ingredient list and the constituents panel. The headline tells you what the maker wants emphasised; the back tells you what is actually in the bag.

The one calculation that fixes most of this

If you do only one thing, convert everything to a dry-matter basis before comparing two foods. Dry-matter percent is 100 minus the moisture percent, and an as-fed figure becomes a dry-matter figure by dividing by the dry-matter percent and multiplying by 100. This single step neutralises water, which is why a wet food showing 10 percent protein at 80 percent moisture is actually around 50 percent protein on a dry-matter basis, while a kibble at 30 percent protein and 8 percent moisture is around 32.6 percent. The "richer-looking" dry food can be the leaner one. Working in dry matter is the only way to put two formats on an equal footing.

Where to go deeper

The mechanics of each line on the panel, from constituents versus composition to the carbohydrate-by-difference calculation, are worked through question by question in our reading and decoding a label FAQ, and the meaning of the various meat descriptors is covered in the controversial ingredients FAQ. If you would rather follow a step-by-step routine, the how to read a pet food label guide turns this into a checklist, and the dry versus wet food comparison guide shows the dry-matter conversion applied to real format choices.

The takeaway (What food)

A pet food label is honest within its rules and misleading outside them. Ingredient order is set before the water goes, splitting can hide a major component in plain sight, the largest fraction is often the one with no line of its own, and the scariest-looking number is frequently benign. None of this means labels are useless. It means a label rewards the reader who knows what it is allowed to leave out, and who reaches for the dry-matter calculation before trusting the front of the bag.