By products in dog food are often misunderstood. While some are nutritious and safe, others may be low-quality fillers. Understanding the difference helps you choose the best diet for your dog.
Key Takeaways
- By products are secondary ingredients derived from animal processing: These include organs, blood, bones, and other parts not typically eaten by humans but rich in nutrients.
- Not all by products are equal: High-quality by products like liver or kidney are highly nutritious, while unnamed or low-grade sources may be less desirable.
- By products can be a sustainable and efficient protein source: They reduce food waste and provide essential amino acids, vitamins, and minerals for dogs.
- AAFCO defines acceptable by products for pet food: The Association of American Feed Control Officials sets standards to ensure safety and nutritional value.
- Look for specific naming on labels: “Chicken by product meal” is better than “meat by product meal” because it specifies the animal source.
- By products are not inherently bad: Many premium dog foods include named by products as key ingredients due to their nutritional benefits.
- Always consider the whole ingredient list: A balanced diet matters more than any single ingredient—focus on overall quality and digestibility.
📑 Table of Contents
What Is a By Product in Dog Food?
If you’ve ever read the ingredient list on a bag of dog food and seen the term “by product,” you might have done a double-take. It sounds a little… off-putting. Maybe even gross. But here’s the truth: by products in dog food aren’t the mysterious, low-quality fillers some people make them out to be. In fact, they can be incredibly nutritious and play an important role in your dog’s diet.
So, what exactly is a by product? Simply put, it’s a secondary product created during the processing of animal tissue for human consumption. Think of it this way: when cows, chickens, or pigs are processed for meat, not every part ends up on your dinner plate. Organs like liver, kidneys, lungs, spleen, and even blood or bones are often set aside. These parts aren’t typically eaten by people in many cultures, but they’re packed with nutrients that dogs need to thrive.
Now, before you wrinkle your nose, remember that dogs are naturally scavengers and opportunistic eaters. In the wild, they’d consume nearly every part of their prey—organs, bones, and all. So, from an evolutionary standpoint, by products aren’t strange or unnatural. They’re actually quite familiar to your dog’s digestive system.
But not all by products are created equal. The quality and nutritional value depend heavily on the source and how they’re processed. That’s why it’s important to know what to look for on the label and how to interpret what you’re feeding your furry friend.
Understanding the Different Types of By Products
Visual guide about What Is a by Product in Dog Food
Image source: cdna.4imprint.ca
When it comes to dog food, not all by products are the same. Some are highly nutritious and beneficial, while others may be less desirable. The key is understanding the difference between high-quality and low-quality by products—and knowing how to spot them on the ingredient label.
Named vs. Unnamed By Products
One of the most important distinctions is whether the by product is named or unnamed. A named by product specifies the animal source, such as “chicken by product meal” or “beef liver.” This transparency is a good sign. It tells you exactly what animal the ingredient came from, which helps ensure consistency and quality.
On the other hand, unnamed by products like “meat by product meal” or “animal by product” are more concerning. These terms don’t specify the source, meaning the ingredient could come from any number of animals—including ones that aren’t typically used in pet food. This lack of specificity can indicate lower quality and less control over sourcing.
For example, a dog food that lists “chicken by product meal” as an ingredient is likely using parts like chicken liver, heart, and gizzard—organs that are rich in protein, vitamins, and minerals. But a product with “meat by product meal” might include parts from unspecified animals, possibly including diseased or contaminated tissue (though regulations do limit this).
Fresh By Products vs. By Product Meal
Another distinction is between fresh by products and by product meal. Fresh by products are raw animal parts that haven’t been cooked or dried. They’re often used in raw or fresh pet food diets and retain more of their natural moisture and enzymes.
By product meal, on the other hand, is made by cooking and drying the animal parts to remove moisture. This process concentrates the protein and fat, making it a more shelf-stable ingredient. While some nutrients may be reduced during cooking, by product meal is still highly digestible and nutritious.
For instance, “chicken by product meal” typically contains ground chicken organs and bones that have been rendered (cooked and dried). This creates a nutrient-dense powder that’s easy to store and mix into kibble. Many high-end dog foods use by product meal as a primary protein source because it’s efficient and economical.
Edible vs. Inedible By Products
It’s also worth noting that not all by products are edible. Some parts of an animal, like hair, horns, or feathers, are inedible and not used in pet food. Reputable manufacturers follow strict guidelines to ensure only edible, safe by products are included.
The Association of American Feed Control Officials (AAFCO) defines acceptable by products for pet food as “the non-rendered, clean parts, other than meat, derived from slaughtered mammals.” This includes organs, blood, and bones—but excludes things like feathers, beaks, and hooves.
So when you see “chicken by product” on a label, you can be confident it doesn’t include inedible parts. It’s made from clean, edible tissues that are safe and nutritious for dogs.
The Nutritional Value of By Products in Dog Food
Now that we’ve cleared up what by products are, let’s talk about why they matter—nutritionally speaking. Despite their bad reputation, many by products are actually powerhouse ingredients that offer significant health benefits for dogs.
Rich in Protein and Amino Acids
One of the biggest advantages of by products is their high protein content. Organs like liver, kidney, and heart are especially rich in complete proteins, meaning they contain all the essential amino acids your dog needs. These amino acids are crucial for building and repairing muscles, supporting immune function, and maintaining healthy skin and coat.
For example, chicken liver is not only high in protein but also packed with vitamin A, iron, and B vitamins. A small amount can provide a big nutritional boost. Similarly, beef kidney is rich in selenium and B12, both of which support metabolism and energy production.
Even bone meal—a common by product—provides calcium and phosphorus, essential minerals for strong bones and teeth. When included in balanced amounts, these nutrients help support your dog’s skeletal health throughout their life.
Packed with Vitamins and Minerals
By products are often more nutrient-dense than muscle meat alone. While muscle meat (like chicken breast or beef sirloin) is a great source of protein, it lacks some of the vitamins and minerals found in organs.
Take liver, for instance. It’s one of the most nutrient-rich foods on the planet—for both humans and dogs. Just a few ounces of liver can provide more than 100% of a dog’s daily need for vitamin A, along with significant amounts of copper, folate, and iron. These nutrients support vision, immune function, and red blood cell production.
Kidneys are another excellent source of B vitamins, especially B12 and riboflavin, which help convert food into energy. Heart tissue is rich in CoQ10, an antioxidant that supports heart health and cellular energy.
Because dogs can’t synthesize certain vitamins on their own, they rely on their diet to get these essential nutrients. By products help fill those gaps, making them valuable additions to a balanced diet.
Highly Digestible and Palatable
Another benefit of by products is their digestibility. Organs and other by products are often easier for dogs to digest than muscle meat because they contain less connective tissue and more moisture. This makes them especially helpful for puppies, senior dogs, or dogs with sensitive stomachs.
They’re also highly palatable—meaning dogs love the taste. If you’ve ever noticed your dog going crazy for a piece of liver or tripe, that’s why. The strong flavor and aroma make by products a natural appetite stimulant, which can be useful for picky eaters or dogs recovering from illness.
In fact, many premium dog food brands use by products as flavor enhancers, reducing the need for artificial additives or fillers. This means your dog gets a tasty, nutritious meal without unnecessary chemicals.
By Products and Sustainability in Pet Food
Beyond nutrition, by products play an important role in sustainability. The pet food industry is a major consumer of animal products, and using by products helps reduce waste and make better use of resources.
Reducing Food Waste
Every year, millions of tons of animal by products are generated during meat processing. If these parts weren’t used in pet food, they’d likely end up in landfills or be incinerated. That’s not just wasteful—it’s environmentally harmful.
By incorporating by products into dog food, manufacturers help divert these materials from waste streams and turn them into valuable nutrition. This supports a more circular economy, where resources are reused rather than discarded.
For example, instead of throwing away chicken hearts and gizzards, companies can process them into high-quality meal for dog food. This not only reduces waste but also lowers the demand for additional livestock production, which has a significant environmental footprint.
Efficient Use of Animal Resources
Using by products is also a smart way to maximize the use of each animal. In an ideal system, every part of the animal is utilized—nothing goes to waste. This aligns with traditional farming practices and respects the animal’s life by ensuring its full value is realized.
From a nutritional standpoint, this is especially important. Dogs benefit from a varied diet that includes different types of protein and nutrients. By products provide that variety, helping to create a more balanced and complete meal.
Moreover, using by products can help keep pet food affordable. Organ meats and other by products are often less expensive than muscle meat, allowing manufacturers to offer high-quality nutrition at a lower cost. This makes premium dog food more accessible to a wider range of pet owners.
Debunking Myths About By Products
Despite their benefits, by products in dog food are often misunderstood. Let’s clear up some of the most common myths and misconceptions.
Myth: By Products Are “Fillers” or Low-Quality Ingredients
One of the biggest myths is that by products are just cheap fillers with no nutritional value. This simply isn’t true. As we’ve seen, many by products are rich in protein, vitamins, and minerals. They’re not fillers—they’re functional ingredients that contribute to your dog’s health.
The confusion often comes from the term “by product” itself, which can sound negative. But in the context of food production, a by product is just a secondary product—not a waste product. It’s like the whey that’s left over when making cheese: it’s not the main product, but it’s still valuable and used in other foods.
Myth: By Products Come from Diseased or Contaminated Animals
Another common concern is that by products come from sick or dead animals. While this was a problem in the past, modern regulations have greatly improved safety standards.
In the U.S., the FDA and AAFCO regulate pet food ingredients to ensure they come from healthy, inspected animals. By products used in dog food must come from animals that were fit for human consumption at the time of slaughter. This means they’re not sourced from diseased, dying, or disabled animals.
Additionally, rendering facilities—where by products are processed—must follow strict hygiene and safety protocols. The high heat used in rendering kills bacteria and pathogens, making the final product safe for consumption.
Myth: Dogs Should Only Eat Muscle Meat
Some pet owners believe dogs should only eat muscle meat, like chicken breast or beef steak. While muscle meat is important, it’s not the only thing dogs need. A balanced diet includes a variety of proteins, including organs and bones.
In fact, feeding only muscle meat can lead to nutritional imbalances. For example, too much muscle meat without enough calcium can cause skeletal problems in growing puppies. By products like bone meal help provide that missing calcium.
Dogs are omnivores with carnivorous tendencies, meaning they thrive on a mix of animal and plant-based foods. By products add diversity to their diet, supporting overall health and well-being.
How to Choose Dog Food with Quality By Products
Now that you understand what by products are and why they matter, how do you choose the right dog food? Here are some practical tips to help you make an informed decision.
Read the Ingredient List Carefully
Start by looking at the ingredient list on the back of the bag. Ingredients are listed in order by weight, so the first few items are the most important.
Look for named by products like “chicken liver,” “beef kidney,” or “lamb heart.” These are specific and high-quality. Avoid vague terms like “meat by products” or “animal digest,” which don’t tell you the source.
Also, check if the by product is listed early in the ingredient list. If it’s one of the first three ingredients, it’s likely a major component of the food—and a good sign of quality.
Check for AAFCO Statements
Make sure the dog food meets AAFCO nutritional standards. Look for a statement like: “This product is formulated to meet the nutritional levels established by the AAFCO Dog Food Nutrient Profiles.”
This ensures the food has been tested and proven to provide complete and balanced nutrition. It also means the by products used are safe and appropriate for dogs.
Research the Brand
Not all pet food companies are created equal. Do a little research on the brand’s sourcing practices, manufacturing standards, and transparency.
Look for companies that disclose where their ingredients come from and how they’re processed. Brands that use human-grade by products or source from USDA-inspected facilities are generally more trustworthy.
You can also check for third-party certifications, like those from the Global Animal Partnership or the Pet Sustainability Coalition, which indicate higher standards.
Consider Your Dog’s Needs
Finally, think about your dog’s age, size, breed, and health status. Puppies, for example, need more calcium and protein, so a food with bone meal or liver might be beneficial. Senior dogs may benefit from easily digestible by products like heart or kidney.
If your dog has food sensitivities or allergies, avoid by products from common allergens like chicken or beef. Instead, look for novel sources like duck liver or lamb kidney.
Always consult your veterinarian if you’re unsure about your dog’s dietary needs. They can help you choose a food that supports your dog’s unique health requirements.
Conclusion
By products in dog food are not the scary, low-quality ingredients some people believe them to be. When sourced responsibly and used correctly, they can be highly nutritious, sustainable, and beneficial for your dog’s health.
From providing essential proteins and vitamins to reducing food waste, by products play a valuable role in modern pet nutrition. The key is knowing how to identify high-quality sources—look for named ingredients, check for AAFCO compliance, and choose reputable brands.
So the next time you see “chicken liver” or “beef kidney” on a dog food label, don’t panic. Instead, recognize it for what it is: a nutrient-rich ingredient that supports your dog’s well-being. With the right knowledge, you can make confident, informed choices about your dog’s diet—and give them the best possible nutrition for a long, healthy life.
Frequently Asked Questions
Are by products in dog food safe?
Yes, by products in dog food are safe when sourced from healthy, inspected animals and processed according to regulatory standards. The FDA and AAFCO ensure that only clean, edible parts are used.
Can by products cause allergies in dogs?
Yes, if your dog is allergic to a specific animal, by products from that source (like chicken liver) could trigger a reaction. Always check the ingredient list and consult your vet if you suspect an allergy.
Are by product meals better than fresh by products?
Both have benefits. Fresh by products retain more moisture and enzymes, while by product meal is more concentrated and shelf-stable. The best choice depends on your dog’s diet and the food’s overall quality.
Do all dog foods contain by products?
No, not all dog foods contain by products. Some premium brands use only muscle meat, while others rely heavily on by products. It depends on the brand’s formulation and philosophy.
Can puppies eat dog food with by products?
Yes, puppies can safely eat dog food with high-quality by products. In fact, organs like liver and kidney provide important nutrients for growth and development.
How can I tell if a by product is high quality?
Look for named sources (e.g., “chicken liver”), check that the food meets AAFCO standards, and research the brand’s sourcing and manufacturing practices. Transparency is key.