How to Compare Two Pet Food Labels

Two bags from the same company can look almost identical. One has an illustration of a puppy, the other says "adult" in type that takes a second look to find. Next to them sits a pouch with a phrase about finishing a meal, printed in the same colors. A useful comparison begins by turning both packages over. Set aside the artwork and find out what each product is meant to do. Once you know that, you can decide which other numbers belong in the comparison.

Match the purpose before the numbers

Read the product name all the way through, including the species and recipe or variety. Record the package size if you are looking at a website, where a single product page may switch to another option when you select a size. With a shop shelf in front of you, take a photo of the label itself. An online comparison is only as good as the two exact products you have selected. A name like "chicken dinner" can refer to several different textures, package sizes and formulations.

In the United States, look for the nutritional adequacy statement. The FDA's guide to complete and balanced pet food describes how to recognize food intended to serve as a sole diet and how statements may refer to nutrient profiles or feeding trials. Read all the way to the end. A product suitable for a particular life stage has a different purpose from one intended for intermittent or supplemental feeding. When buying abroad, use local labeling and ask the maker about any unfamiliar terms.

Decide what you actually need. If you want the food used for everyday meals, compare products intended for that purpose and the relevant life stage. If you want an occasional topper, compare the topper with other options you could use in that role. A handy price on a box of individual pouches is beside the point if you thought you were buying dinner and the package is meant to supplement dinner. For a pet whose veterinarian has recommended a particular diet, bring the exact labels to the veterinary team before changing foods.

Compare the same amount of energy

Find the calorie statement and write down its unit. One can might list calories per tin. A dry food might give calories per cup and per kilogram. An unfamiliar word such as "serving" can refer to a specific quantity stated elsewhere on the label. Keep the unit next to the number. A list that says "340, 290" is very hard to interpret a week later without knowing what was measured.

As a comparison example, imagine one wet food gives 120 calories in a 100 gram tray and another gives 135 calories in a 150 gram tin. The second package contains more calories. Per gram, the first has 1.20 calories and the second has 0.90. This is ordinary division using the package figures. It explains why comparing whole containers answers a different question from comparing equal weights. It also helps predict how quickly a package will run out once the usual serving has been established for a specific pet.

The reverse problem appears with dry food. Two products could have similar calorie values per 100 grams yet have pieces that settle differently in a cup. Use the same unit from both labels before drawing a conclusion. The manufacturer may have information when a calorie figure is absent or when the label you can find online is too blurry to read. An established gram amount for one food should stay attached to that food in your notes. It is easy to mistake a familiar scoopful for a universal portion when the container looks much the same.

Read moisture in context

The guaranteed analysis gives another set of figures. In the United States you will commonly see minimums for crude protein and fat and maximums for crude fiber and moisture. The figures are guarantees, so read the small words beside the percentages. They should not be treated as exact measurements of the contents of a particular package. Manufacturer information can help if you need a typical nutrient value for a specific reason.

Moisture matters because the percentage on a label generally describes the food as sold. A wet product contains more water per gram than dry kibble, which can make the printed figures look deceptively far apart. The FDA guide shows how to make a dry matter comparison using the moisture and nutrient percentages. Think of the result from guaranteed minimums and maximums as an approximate label comparison. This exercise can answer a question about the published numbers, but the resulting percentage alone cannot tell you which product meets an individual pet's needs.

Leave the ingredient list for questions it can answer well. It can help identify whether a named ingredient is listed. It is less suited to ranking two diets for overall nutritional quality by the first three lines. Ingredients contribute different amounts of water and nutrients, and the list alone gives a limited picture of what is present in the finished food. The WSAVA guide to selecting a pet food lists questions about formulation expertise, testing and availability of product information that can help when the label leaves something unresolved.

Calculate a cost you can use

Imagine one pack is cheaper to buy but contains half as many grams. Compare prices per equal weight or compare the cost of supplying the same amount of food energy, if you have the necessary package values and your two candidates have similar intended uses. To calculate a package's calories from a calorie value per 100 grams, divide the package weight by 100 and multiply by the stated calories. Then divide the price by the total calories and multiply by 100 to get the cost per 100 calories. Round the result sensibly given the precision of the label.

Now add the constraints you can see at home. With a package that you regularly open and throw part of away, the portion actually used matters more than the amount printed on the outside. Can you store opened food according to the instructions and use it within the time stated? Will the spare bags fit in a suitable dry cupboard? Compare the products using the same assumptions about wastage. Running the numbers on paper is useful precisely because it separates a sticker price from the likely cost of a week of meals.

If those two sample packages each cost two dollars, the 120-calorie tray costs about $1.67 per 100 calories and the 135-calorie tin costs about $1.48 per 100 calories, assuming you can use the entire package. This comparison changes if a portion of the larger package usually goes unused. In that case, use the energy in the amount you can serve and keep the same purchase price in the calculation.

Look for facts you still need before buying a large quantity. The size you can find every week is important if the shop's bulk offer appears only occasionally. A recipe available in two packs may have two different openings or shapes that change how easy it is to handle and store. Note whether a single trial package is available, and keep a record of the exact option instead of relying on a picture of the whole brand range.

Turn the comparison into a short note

A practical note has room for the exact names, both adequacy statements, the calorie information with its units, the cost at the package size you would buy, and any unanswered question. It can fit on a single piece of paper. If your primary question was "which one can serve as a daily food for this pet's life stage?" highlight that line and put the other data beneath it. In a shop, this makes it easy to resume the comparison after getting interrupted.

Take a picture of the package you actually bring home. If the product label on the shelf differed from the page you saved earlier, record the package details. This is particularly useful when the manufacturer sells similar-looking variants. Later, if you want to check the calorie statement again, the photo will remind you which side of the bag contains it and spare you the trouble of opening a heavy container.

As an exercise, try comparing the food already in the cupboard with the most plausible alternative in your local shop. Use a pair with the same intended purpose. Write down one question each label answers quickly and one question you need to take elsewhere. You might find both are clear about life stage and one gives no calorie value in a unit you can readily use. This is enough information to decide your next action, such as asking the manufacturer for calories per gram or asking your veterinarian whether either option is appropriate. You can leave the shelf with an answer to the question you came with, even when the package you buy is the same one you brought home last time.

Try one more check if the packages both pass the first comparison. Find the customer contact printed on each one and write a question that refers to the exact recipe and size. Ask for one comparable figure in a named unit, such as calories per 100 grams. If the reply is for a different flavor or omits the unit, ask for clarification before entering it. Keeping that reply with your notes gives you a number you can revisit when the retailer changes its listing. Date the comparison so an older number does not silently carry over to a revised label.