Meat and bone meal is a dry, brown powder made from animal tissues and bones that have been cooked at high temperatures, ground up, and had most of the fat removed. It shows up on dog food ingredient lists as a concentrated source of protein and minerals, typically containing 45% to 50% protein by weight. It’s one of the most common rendered ingredients in commercial pet food, but it’s also one of the most debated because of questions about quality, digestibility, and transparency.
How Meat and Bone Meal Is Made
The production process is called rendering. Slaughterhouse materials that aren’t used for human consumption, including organs, trimmings, bones, and connective tissue, are ground through a large plate grinder and then cooked at temperatures typically ranging from 133°C to 145°C (roughly 270°F to 293°F). This prolonged high heat kills bacteria and other pathogens, separates the fat from the solid material, and drives off moisture.
After cooking, the melted fat is drained or pressed out, and the remaining solids are ground again into a fine, shelf-stable powder. The result is a nutrient-dense ingredient that’s easy to store, transport, and mix into kibble or canned food formulations. The high-heat processing is what makes the ingredient safe from a microbial standpoint, but it also affects how well dogs can absorb the nutrients, which is a key tradeoff.
Nutritional Content
Meat and bone meal packs a lot of protein and minerals into a small amount of material. A higher-quality version is typically guaranteed at a minimum of 50% crude protein, while lower grades contain around 45%. Crude fat content runs about 8.5% for both grades. Because bones are ground into the mix, the calcium content is notably high: around 9% to 11%, depending on the ratio of bone to soft tissue in the batch.
That calcium-to-protein ratio is one way to gauge quality. A meal with more bone relative to meat will have higher ash (mineral) content and lower protein. Cheaper formulations tend to skew toward more bone, which dilutes the protein value and can push calcium levels higher than ideal for some dogs, particularly large-breed puppies where excess calcium can contribute to developmental bone problems.
How Well Dogs Digest It
Not all protein sources are created equal when it comes to how much your dog actually absorbs. Meat and bone meal has an average crude protein digestibility of about 76% in dogs. That means roughly three-quarters of the protein makes it through digestion and into the bloodstream. The remaining quarter passes through unused.
For comparison, poultry by-product meal scores closer to 85% digestibility. Fresh muscle meat typically scores even higher. The gap matters because a food might look protein-rich on the label, but if a significant portion of that protein isn’t bioavailable, your dog isn’t getting the full benefit. The high rendering temperatures that make meat and bone meal safe also damage some amino acids, particularly making them harder for digestive enzymes to break down efficiently.
Digestibility also varies quite a bit between batches. The range in protein content alone (39% to 46% in one study of commercial samples) hints at how inconsistent the raw materials can be. Some batches come from leaner trimmings with less bone; others are heavier on skeletal material. This variability is part of what makes generic meat and bone meal a less predictable ingredient than named, single-species meals.
The Species Transparency Problem
When a dog food label says “chicken meal” or “beef meal,” you know which animal it came from. When it says “meat and bone meal,” you don’t. Federal regulations require ingredients to be listed by their common or usual name, and the Association of American Feed Control Officials (AAFCO) defines acceptable names for pet food ingredients. “Meat and bone meal” is a recognized term that doesn’t require the manufacturer to specify whether the source is cattle, pigs, sheep, or a combination.
For export purposes, USDA documentation does require identifying the species of origin, and mixed-source products must be labeled as “mixed species meat and bone meal.” But this level of detail doesn’t carry over to the pet food label your dog’s food bag carries at the store. A manufacturer using meat and bone meal could be sourcing from a single species or blending whatever is available and cost-effective at the time. This is why many pet food reviewers and veterinary nutritionists view named meals (like “lamb meal” or “salmon meal”) as a sign of better ingredient control.
Safety and Contaminant Concerns
Because meat and bone meal is made from materials that didn’t go into the human food supply, questions about contaminants have followed the ingredient for years. One persistent concern involves pentobarbital, the drug used to euthanize animals. If euthanized animals were to enter the rendering stream, trace amounts of the drug could survive processing.
The FDA has investigated this issue multiple times. In 2018, the agency expanded its surveillance program to test fats, greases, tallows, and oils of animal origin that could end up in pet food manufacturing. The agency uses sensitive lab methods (liquid chromatography tandem mass spectrometry) to screen for pentobarbital at very low concentrations. While the rendering industry maintains that euthanized pets do not enter the supply chain for pet food-grade meal, the FDA’s ongoing testing reflects the fact that the concern hasn’t been fully put to rest in the public’s mind.
The high cooking temperatures used in rendering do effectively eliminate bacterial contamination from Salmonella, E. coli, and similar pathogens. From a food safety standpoint, properly rendered meat and bone meal is microbiologically clean. The contaminant questions are really about what goes into the renderer, not what survives the heat.
Meat and Bone Meal vs. Named Meat Meals
If you’re comparing ingredient lists, the distinction between “meat and bone meal” and a named meal like “chicken meal” comes down to three things: species identification, consistency, and perceived quality.
- Species identification: Named meals tell you the animal source. Generic meat and bone meal does not, and the source can change between production runs.
- Bone-to-meat ratio: “Chicken meal” or “lamb meal” can still contain bone, but named meals from poultry sources tend to have higher protein digestibility (around 85%) compared to generic meat and bone meal (around 76%).
- Price signal: Meat and bone meal is generally cheaper than named single-species meals. Foods that rely on it as a primary protein source are typically budget formulations. That doesn’t automatically make them harmful, but it does suggest less selectivity in sourcing.
Some dogs do perfectly well on foods containing meat and bone meal, especially when it’s used as a secondary protein source alongside a named meal or fresh meat. The ingredient becomes more of a concern when it’s the first or only animal protein listed, because that means the bulk of your dog’s protein is coming from a less digestible, less transparent source.
Reading the Label
Ingredients on pet food labels are listed by weight before processing. Meat and bone meal, because it’s already dried, can appear deceptively low on the list compared to fresh meat (which is roughly 70% water). A food listing “chicken” first and “meat and bone meal” third might actually derive more of its protein from the meal than from the fresh chicken once you account for moisture.
If you see “meat and bone meal” on a label, it’s worth checking how many other animal protein sources are listed and whether any of them are named. A formula that pairs meat and bone meal with “chicken meal” and “whole chicken” is using it as a supplement. A formula where meat and bone meal stands alone is leaning on it as the primary protein, and your dog’s actual protein absorption will reflect that 76% digestibility figure rather than the higher numbers associated with fresher or more specific ingredients.