What is “As-Fed” vs. “Dry Matter” Basis?
When it comes to feeding our dogs, we want to ensure that every meal is packed with the right nutrients. But interpreting the information on pet food labels can be tricky — especially when comparing kibble, canned, or fresh diets. One of the most crucial concepts to understand when evaluating dog food is the difference between the “as-fed” and “dry matter” basis. This distinction helps us get a clearer picture of the actual nutrient content of the food, so we can make more informed decisions about what we’re feeding our pets.
What’s in the bowl
Reflects nutrient levels of food in its natural form — exactly as it comes out of the bag, can, or package. Moisture is included, which can be misleading when comparing food types.
The true nutrient picture
Removes water from the equation entirely, letting you see nutrient content as if the food were completely dry. The most reliable method for comparing across products.
In this blog post, we’ll dive deep into why this difference matters, how it affects the way we evaluate dog food, and how you can calculate dry matter to compare products more accurately. We’ll also explore how to avoid common pitfalls in interpreting food labels and ensure your dog is getting the best possible nutrition.
Understanding “As-Fed” vs. “Dry Matter” Basis
As-Fed Basis
The as-fed basis reflects the nutrient levels of a food in its natural form—essentially how it comes out of the bag, can, or package. This means that the nutrient percentages include everything, including the moisture content. Since different types of dog food contain vastly different amounts of moisture, comparing foods based on the as-fed basis alone can be very misleading.
For example, a typical kibble might contain around 10% moisture, while fresh, canned or raw food can have as much as 75% moisture. On an as-fed basis, a wet food will often appear to have much lower levels of protein, fat, and other nutrients simply because the water content dilutes everything.
While the as-fed basis is useful for understanding what you’re putting in your dog’s bowl, it doesn’t give an accurate sense of the nutritional density of the food.
Dry Matter Basis
The dry matter basis, on the other hand, removes water from the equation entirely, allowing you to see the nutrient content as if the food were completely dry. This gives a clearer picture of the nutritional value because you’re comparing just the nutrients themselves without the diluting effect of moisture.
Since different types of dog food can vary so much in their moisture content, using the dry matter basis is the most reliable way to compare nutritional quality across products.
Why This Matters: Real-World Implications
The distinction between as-fed and dry matter may seem like a technical detail, but it has real implications for your dog’s health and diet. Here are a few key reasons why this differentiation is so important:
Accurate comparison between food types
Dog food comes in many forms: dry kibble, wet food, fresh cooked, freeze-dried, raw, and even home-cooked meals. Each of these types has a different moisture content. If you’re comparing protein levels in wet food versus dry kibble, you might think kibble has more protein because the number looks higher on the label. But once you account for moisture content, that wet food might actually pack more protein per gram of dry matter than the kibble.
Optimizing nutrient intake
If you’re aiming to provide a balanced diet or manage your dog’s weight or specific health conditions (e.g., low-fat diets, high-protein diets), it’s crucial to know exactly how much of each nutrient is in the food. Relying on as-fed values could result in over- or underfeeding certain nutrients, leading to imbalances or health problems over time.
Avoiding misleading packaging claims
Pet food labels often emphasize certain nutrients or ingredients as a selling point. For example, a label might promote a wet food as “high in protein,” but when you look at the guaranteed analysis, the protein might only be listed as 10% on an as-fed basis. This might sound low compared to kibble, which often contains 25-30% protein, but the true protein content can only be assessed by converting both to a dry matter basis.
