Pet food labels can be a slog to read, and a lot of people feel that way. If you want to learn How to Read Guaranteed Analysis on Pet Food, the guaranteed analysis panel is one of the most useful places to start. At first glance, the guaranteed analysis panel seems straightforward, but many pet owners still misread it. In this guide, you’ll see where the panel is, what each number is telling you, and how to compare foods in a way that’s actually useful. No science degree needed. It’s for any pet owner who wants to make smarter food choices.

You’ll learn how to read protein, fat, fiber, and moisture values. You’ll also see why “minimum” and “maximum” matter, and how to convert label numbers to dry matter so wet and dry food can be compared fairly. Just as important, the guide explains what guaranteed analysis does not tell you. That part matters. If you want a wider look at the full label after this, Dog Food Labels Explained for Smarter Buying is a helpful next read.

Before you start with How to Read Guaranteed Analysis on Pet Food

Here’s what you’ll need before you begin:

• A bag, can, or pouch of your pet’s food
• A phone or basic calculator
• The guaranteed analysis panel on the package
• The calorie statement and nutritional adequacy statement on the label
• A pen or notes app if you want to compare more than one food

Tip: If you’re comparing foods, grab at least one wet food and one dry food. That helps. It’s easier to follow the dry-matter step when the two are side by side.

Step 1: Find the guaranteed analysis panel

Flip the package over. You’ll usually find the guaranteed analysis on the back or side of the label, often near the ingredient list and feeding guide.

The guaranteed analysis for a pet food product is normally located on the back or side of the package near the ingredient list.

Pet food labels generally need to show this panel. Under AAFCO guidance, expect 4 core parts: crude protein, crude fat, crude fiber and moisture. Those numbers give you a simple way to compare one food with another.

That last number, 6.25, comes from the lab method for estimating crude protein from nitrogen content. You don’t need to do that math yourself. But it does help explain why the word ‘crude’ appears on labels.

Common mistake: Only checking the front of the bag. Marketing words there aren’t the same as the legal nutrition panel.

Step 2: Learn what the four basic numbers mean

Go through the panel line by line. The four main numbers you’ll see are:

• Crude protein (minimum)
• Crude fat (minimum)
• Crude fiber (maximum)
• Moisture (maximum)

The guaranteed analysis must report crude protein (minimum), crude fat (minimum), crude fiber (maximum) and moisture (maximum) as percentages (grams per 100 grams of pet food) in fresh matter ('as is').

Those numbers don’t all work in the same way. Protein and fat show the least the food should contain, while fiber and moisture show the most the food should contain. The rule changes depending on which one you’re reading.

So if one food says protein 26%, it should have at least 26% protein on an as-fed basis. If another says moisture 10%, it should have no more than 10% moisture.

The word ‘crude’ doesn’t mean low quality or poor ingredients. It only refers to the test method. That’s all. It doesn’t say whether the food is good or bad.

Tip: Think of guaranteed analysis as a starting point, not the whole story. It helps when you compare nutrient levels, but it won’t tell you about ingredient quality, digestibility, or whether the food fits your pet’s health needs.

If you’re choosing between dog formulas, you may also want to read Best Dog Food: What to Look For Before You Buy after this guide.

Step 3: Check whether you are reading ‘as-fed’ numbers

Many people skip this step. Guaranteed analysis values are usually listed on an as-fed basis, so the numbers include the water in the food.

AAFCO explains the difference clearly:

The values given in the Profiles are listed in terms of dry matter (DM). However, the values listed in the guaranteed analysis on dog and cat food labels are given on an 'as is' or 'as fed' (AF) basis.

That matters because water changes the numbers. A wet food can look low in protein on the label simply because it has a lot more moisture than dry food.

The FDA notes that canned pet food is typically 75% to 78% moisture, while dry pet food is typically 10% to 12% moisture.

Canned pet food is typically 75 to 78 percent moisture, whereas dry pet food is typically 10 to 12 percent moisture.

So a canned food with 10% protein isn’t automatically lower in protein than a dry food with 26% protein. It may just include a lot more water.

Common mistake: People compare wet and dry foods directly from the label without adjusting for moisture. That’s easy to do, but it can lead to the wrong choice. You can also compare feeding styles with Dry vs Wet Dog Food: What Matters Most.

Step 4: Convert the numbers to dry matter in How to Read Guaranteed Analysis on Pet Food

To compare labels on equal terms, use this simple math. Use this formula:

• Dry matter % = 100, moisture %
• Dry-matter nutrient % = as-fed nutrient % ÷ dry matter % x 100

Here’s a real example based on the FDA method. Say a canned food label shows:

• Protein: 10%
• Moisture: 78%

First, find the dry matter:

• 100, 78 = 22% dry matter

Then convert the protein:

• 10 ÷ 22 x 100 = 45.5% protein on a dry-matter basis

That means the label says 10%, but once the water’s removed, the canned food is actually much higher in protein than it first appears.

To make comparisons easier, here’s how common moisture ranges affect dry matter.

A wet food can look lower in protein on an as-fed basis. Once water is taken out of the math, it may end up being higher.

Tip: Save the formula in your phone notes. It’s useful. If you compare foods often, it starts to feel more natural after a couple of tries.

Step 5: Use the numbers the right way

Once you know how to read and convert guaranteed analysis, use it where it helps most. It’s especially helpful when you’re comparing:

• higher and lower protein foods
• higher and lower fat foods
• fiber levels for stool quality or hairball support
• moisture levels for hydration support

It’s even more useful if your vet tells you to keep a closer eye on fat, fiber, or moisture.

Guaranteed analysis doesn’t tell the whole story. It matters, but it has limits. It won’t show whether the food is complete and balanced for your pet’s life stage, and it won’t tell you where the ingredients come from, how digestible the food is, or how many calories are in each cup or can.

Check guaranteed analysis alongside the nutritional adequacy statement and the calorie information. With dog foods, people may point to AAFCO nutrient profile reference values of 18.0% crude protein for adult maintenance and 22.0% for growth and reproduction on a dry-matter basis. Those numbers matter. They’re not the same as the as-fed guaranteed analysis line.

Common mistake: judging the whole food by a single number, like protein alone. It’s better to look at the full picture. A better choice looks at the full label along with your pet’s needs.

For cat owners, Best Cat Food for Indoor Cats and Seniors can help with life stage and daily needs once you understand the analysis panel.

Step 6: Watch for label changes and know when to ask for help

Pet food labels are changing. According to AAFCO, its label modernization work is the first major update to pet food labels in more than 40 years. The goal is to make labels easier for pet owners to understand, with a friendlier format and clearer nutrition details.

There’s another big change too. New labeling systems are moving away from crude fiber and toward total dietary fiber, which may eventually help shoppers understand fiber quality better instead of relying on a rough test value.

For now, don’t overcomplicate it. Treat guaranteed analysis as one tool, not the whole picture. If your pet has allergies, digestive problems, kidney disease, weight issues, or is very young or very old, don’t rely on the label instead of getting advice from your vet or another medical professional.

Questions regarding your pets' health and/or the specific use of any veterinary drug, pet food, or other product should always be referred to your veterinarian.

Tip: If two foods seem similar on paper, ask your vet which nutrient matters most for your pet: protein, fat, fiber, moisture, or calories.

How to tell if you read it correctly

You’ve read a guaranteed analysis panel correctly if you can do these five things:

1. Find the panel on the package
2. Identify protein, fat, fiber, and moisture
3. Tell which values are minimums and which are maximums
4. Explain that the numbers are generally as-fed
5. Convert a nutrient to dry matter for a fair wet-vs-dry comparison

Pet food labels feel a lot less confusing once you can do those steps.

Now for the easy part. Grab one food from your pantry and one product you’re thinking about buying, then compare the guaranteed analysis on both as you convert the protein and fat to dry matter for a fair check. Then check the calorie statement and the nutritional adequacy statement. If you want to look through supplies and feeding essentials as you put together a better pet routine, you can check True Pet Market or visit the brand’s Shopify pet supply store for everyday pet care items. If your pet has special needs, ask your vet.