Chicken by-product in dog food refers to the parts of a chicken left over after the breast, thigh, and other cuts are removed for human consumption. These include organs like the liver, kidneys, lungs, and spleen, along with necks, feet, intestines, and undeveloped eggs. Despite the unappetizing name, these parts are nutrient-dense and provide a concentrated source of protein, healthy fats, vitamins, and minerals for dogs.
What Parts Are Included (and Excluded)
The Association of American Feed Control Officials (AAFCO), which sets ingredient definitions for pet food in North America, defines poultry by-product meal as “the ground, rendered clean parts of the carcasses of slaughtered poultry such as necks, feet, undeveloped eggs and intestines.” When the label says “chicken” specifically, the by-products come from chickens rather than a mix of poultry species.
Feathers are explicitly excluded from the definition, except in trace amounts that might occur during normal processing. Hair, horns, teeth, and hooves are also prohibited, though those apply more to mammalian by-products than poultry. The internal organs that are included, particularly liver and kidneys, are the same parts that many cultures consider delicacies and that raw-feeding advocates intentionally seek out for dogs.
By-Product vs. By-Product Meal
You’ll see two related but distinct terms on dog food labels: “chicken by-products” and “chicken by-product meal.” The difference comes down to moisture. Fresh chicken by-products still contain their natural water content, similar to raw meat. Chicken by-product meal has already been dried and ground through a process called rendering, bringing its moisture down to roughly 10%. This makes meal a far more concentrated protein source by weight.
This distinction matters when you’re reading ingredient lists. Pet food labels list ingredients by weight before cooking. Fresh chicken by-products weigh more because of their water content, so they can appear higher on the label even if the final product contains less chicken protein than a food listing chicken by-product meal lower down. A food with chicken by-product meal as the first ingredient delivers a genuinely protein-heavy formula, because that ingredient doesn’t lose significant weight during manufacturing.
Nutritional Profile Compared to Whole Chicken
Chicken by-product meal is surprisingly high in protein. On a dry-matter basis, it contains around 67% protein compared to about 42% for raw whole chicken. The difference exists largely because rendering removes most of the fat and water, concentrating the protein. Raw chicken carries over 50% fat on a dry-matter basis, while chicken by-product meal sits closer to 16%.
The amino acid profile is also notable. Chicken by-product meal delivers nearly twice the arginine of raw chicken, about 30% more lysine, and almost four times the glycine. Glycine is particularly abundant because by-products include connective tissue and bone, both rich in this amino acid. Taurine, which supports heart and eye health in dogs, is present at roughly 3.5 times the concentration found in raw chicken.
The higher mineral (ash) content in by-product meal, around 16% compared to 6-8% in whole chicken, reflects the inclusion of bone. This contributes calcium and phosphorus, both essential for skeletal health, though the ratio needs to be balanced in the overall diet formula.
How Rendering Works
Rendering is the process that transforms raw chicken parts into the dry, shelf-stable meal you see listed on ingredient labels. The raw by-products are cooked at high temperatures, typically around 140°C (284°F), under pressure for about 45 minutes. This does three things simultaneously: it kills bacteria and other pathogens, separates fat from protein, and drives off moisture.
The tradeoff is that higher temperatures and longer cooking times reduce certain heat-sensitive amino acids like lysine, methionine, and cystine. Proteins also become less soluble as temperature rises. Manufacturers optimize their process to maximize protein content while minimizing nutrient loss, but some degradation is inherent to rendering. This is one reason why premium pet food brands pay attention to the quality of their rendering process and not just the ingredients going in.
Safety and Regulation
Facilities that produce chicken by-product meal for pet food fall under FDA oversight through the Food Safety Modernization Act. This requires manufacturers to follow current good manufacturing practices and maintain a written food safety plan. That plan must identify biological, chemical, and physical hazards and put preventive controls in place, including process controls for cooking temperatures, sanitation procedures to prevent contamination, and monitoring systems to verify everything is working.
AAFCO definitions add another layer of oversight by specifying exactly what can and cannot be included in a by-product ingredient and setting minimum nutrient guarantees. If a product labels its ingredient as “chicken by-product meal” specifically, it must come from chickens rather than a generic poultry mix.
Why It Gets a Bad Reputation
The negative perception of chicken by-products largely comes from the “ick factor” of eating organs, feet, and intestines, not from any nutritional shortcoming. In reality, organ meats are among the most nutrient-dense foods available. Liver alone is packed with vitamin A, B vitamins, and iron. Kidneys and spleen add further mineral diversity.
The real quality concern isn’t whether by-products belong in dog food but rather the consistency and sourcing of the by-products used. Because the ingredient definition covers a wide range of parts, the exact nutritional profile can vary between batches and between manufacturers. A by-product meal heavy in organ meats delivers a different nutrient profile than one heavy in feet and necks. Higher-quality manufacturers control for this variability through sourcing standards and testing, which is one reason the same ingredient name can represent meaningfully different quality levels across brands.
If you’re evaluating a dog food that contains chicken by-products, the ingredient itself isn’t a red flag. What matters more is the manufacturer’s sourcing transparency, the overall nutrient profile guaranteed on the label, and whether the formula meets AAFCO nutrient standards for your dog’s life stage.