Common Fillers in Commercial Dog Foods

Common Fillers in Commercial Dog Foods

Dive deep into the world of commercial dog foods to uncover the most common fillers used, their impacts on your dog's health, and how to make informed choices for your furry friend.

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The information provided in this article is intended for general informational purposes only and does not constitute professional veterinary advice. Always consult your veterinarian before administering any medication to your pet. The content was created by AI and should not be used as a substitute for professional veterinary consultation and diagnosis. The Munch Zone and the author assume no responsibility for the use or misuse of this information.

The pet food industry has seen a significant transformation over the years, with an increasing emphasis on the quality of ingredients used in dog foods. Despite this positive trend, many commercial dog foods still contain fillers—ingredients that provide little to no nutritional value to your dog. These fillers are often used to reduce manufacturing costs, help maintain shelf life, or improve the food’s texture and appearance. Understanding the common fillers used in commercial dog foods is crucial for pet owners who wish to provide their dogs with a nutritious and balanced diet.

What Are Dog Food Fillers?

Fillers are ingredients added to dog food that are of low nutritional value. They are primarily used to add bulk to the food, allowing manufacturers to produce it more cheaply or to make the product appear more substantial. While some fillers can provide a minimal amount of dietary fiber, which is beneficial to a dog’s digestive system, they are generally considered subpar when it comes to meeting a dog’s nutritional needs.

Common Types of Fillers

1. Grains and Cereals

Corn, Wheat, and Soy: These grains are among the most common fillers found in dog food, primarily because they are cost-effective carbohydrate sources. However, their nutritional value for dogs is a subject of debate. Corn is often criticized for being a cheap energy source that is difficult for dogs to digest, potentially leading to spikes in blood sugar and contributing to weight gain. Wheat and soy are known allergens that can cause adverse reactions in some dogs, including skin itching and gastrointestinal distress. Furthermore, these grains are often used in processed forms, which can further reduce their nutritional benefits.

Rice and Barley: While not as problematic as corn, wheat, or soy, rice and barley are sometimes used in excess as fillers. Brown rice and barley can offer more nutritional value, including fiber and vitamins, but they should still be balanced with high-quality protein sources to ensure a well-rounded diet for dogs.

Grains and Cereals

2. By-Products

Meat By-Products: Meat by-products include non-muscle parts of animals, such as organs, bones, and tissues. While some by-products, like liver and kidneys, are rich in nutrients, the term “by-products” can also encompass less desirable parts. The nutritional quality of by-products varies greatly depending on the source and processing method. High-quality by-products can be beneficial for dogs, but low-quality options often serve more as fillers than nutritious ingredients.

Poultry By-Products: Similar to meat by-products, poultry by-products are made from non-muscle parts of birds. They can be a source of protein and other nutrients if sourced and processed carefully. However, the inconsistency in quality and the potential inclusion of low-nutrient parts make them a controversial filler.

By-Products and Meat Meals
By-Products and Meat Meals

3. Cellulose

Plant-Based Fiber: Cellulose, a plant-based fiber, is extracted from the cell walls of plants. It’s used in dog food to add bulk and help with stool consistency. While fiber is an essential part of a dog’s diet, contributing to gut health, cellulose is considered a low-quality filler when used in excess. It provides little to no nutritional value beyond its role in promoting bowel regularity. The source of cellulose can also vary, with some coming from wood pulp, making it a less desirable ingredient compared to more nutritious fiber sources like vegetables and fruits.

4. Pea Protein and Other Legume By-Products

Legume-Based Proteins: In the quest for grain-free dog food options, manufacturers have turned to legumes like peas, lentils, and chickpeas as carbohydrate and protein sources. Pea protein, in particular, is concentrated from peas, removing much of the fiber and nutrients while retaining the protein. While legumes can provide a source of protein and are less likely to cause allergies compared to grains, their amino acid profile is incomplete compared to animal proteins. This means they should not be the primary protein source in dog food. Excessive use of legume by-products can also lead to an imbalance in certain nutrients, such as taurine, which is essential for heart health.

Pea Protein and Other Legume By-Products

5. Artificial Colors and Flavors

Non-Nutritive Additives: Artificial colors and flavors are added to dog food to make it more appealing to pet owners and to encourage pets to eat foods that might otherwise be unattractive or bland. These additives do not provide any nutritional benefit and, in some cases, may be harmful. Artificial colors have been linked to behavioral issues and allergic reactions in dogs, while artificial flavors can encourage overeating or mask the taste of low-quality ingredients. Natural alternatives, such as spices and herbs, can provide flavor enhancement without the health risks associated with synthetic additives.

Artificial Colors and Preservatives

The Impact of Fillers on Dog Health

The use of fillers in dog food can have several negative effects on a dog’s health. For one, fillers can lead to obesity. Because they are less nutrient-dense, dogs may need to eat more to feel satiated, leading to an excessive calorie intake. Additionally, the low nutritional value of fillers means that dogs are not receiving the essential vitamins, minerals, and proteins they need for optimal health. This can result in deficiencies and related health issues over time.

Fillers can also exacerbate food allergies and sensitivities. Ingredients like corn, wheat, and soy are known allergens for some dogs, leading to skin irritations, gastrointestinal upset, and other allergic reactions. Furthermore, the poor digestibility of certain fillers can strain a dog’s digestive system, causing issues like bloating, gas, and diarrhea.

Choosing Dog Food Without Fillers

To ensure your dog is receiving a balanced and nutritious diet, it’s important to choose dog food with high-quality ingredients and minimal fillers. Here are some tips for selecting a healthier option for your pet:

  • Read Ingredient Labels: Ingredients are listed by weight, so look for dog foods that list high-quality proteins (e.g., chicken, beef, fish) as the first ingredient.
  • Avoid Artificial Additives: Choose dog foods that do not contain artificial colors, flavors, or preservatives.
  • Look for Whole Foods: Opt for dog foods that use whole foods like fruits, vegetables, and whole grains (for dogs without grain sensitivities) instead of processed by-products and fillers.
  • Consult a Veterinarian: Your vet can recommend specific dog food brands or formulations that would be most beneficial for your dog’s health, considering their age, breed, and any existing health issues.
Bestseller No. 1
Nature’s Recipe Grain Free Salmon, Sweet Potato & Pumpkin Recipe Dry Dog Food, 24 lb. Bag
  • Contains one (1) 24-pound bag of Nature′s Recipe grain free dry dog food
  • Number-one ingredient is real salmon, a quality protein source that helps maintain optimal muscle strength
  • Fiber from sweet potatoes and pumpkin helps support digestion and immune system health
  • Natural dog food with added vitamins, minerals and nutrients — no poultry by-products or artificial colors, preservatives or flavors, and no added corn, wheat or soy
  • Delicious, premium nutrition that′s honestly made and reasonably priced
Bestseller No. 2
BIXBI Liberty Grain Free Dry Dog Food, Original Recipe, 4 lbs - Fresh Meat, No Meat Meal, No Fillers for Easy Digestion - USA Made
  • MADE WITH FRESH CHICKEN, TURKEY & FISH—NO MEAT MEAL: BIXBI Liberty dog food starts with fresh chicken, turkey and fish and adds whole ingredients, never cheap fillers—no chicken meal, no meat meal and no fish meal
  • CONVENIENT EVERYDAY NUTRITION: Offer the perfect combination of nutrition, high quality ingredients, affordability and convenience, including omega-6 and omega-3 fatty acids from salmon oil for a healthy skin and coat, for a happy and healthy pet
  • EASY DIGESTION FOR ALL DOGS & FOR ALL AGES: Digestibility levels, a food’s ability to deliver essential nutrients, indicates dog food quality; Minimally processed protein, cooked only once delivers more bioavailable nutrients than rendered meal powders
  • NO WHEAT, CORN, SOY OR GRAIN: Made without fillers like wheat, corn, soy or other grains, BIXBI Liberty dry dog food is perfect for dogs on a limited ingredient diet and presents the right quality and quantity of high quality ingredients
  • USA MADE: Made with USDA inspected fresh turkey, chicken and fish, the clean and pure ingredients provide dog approved taste
Bestseller No. 3
Natural Balance Limited Ingredient Small Breed Adult Grain-Free Dry Dog Food, Salmon & Sweet Potato Recipe, 4 Pound (Pack of 1)
  • SALMON IS THE FIRST ANIMAL PROTEIN SOURCE providing essential protein and amino acids to help maintain strong muscles; Sweet Potatoes are included as a grain-free source of fiber to help support digestive health; Contains (1) 4-Pound Bag
  • WITH SENSITIVE PETS IN MIND we’ve carefully chosen a simplified list of premium ingredients to help support a healthy coat, skin & digestive system; made with a single animal protein source, and no added grain, soy, gluten, or artificial colors or flavors
  • SPECIALLY FORMULATED FOR SMALL DOGS Made with the same balanced nutritional philosophy, our Small Breed recipes are tailored to your dog. Every bite is packed with flavor! Smaller size accommodates smaller jaw sizes for easier eating
  • NUTRITION FOR EVERY TYPE OF DOG Any dog can enjoy our delicious recipes, not just dogs with sensitive stomachs, irritable skin or allergies; Our purposefully crafted formulas reduce the number of ingredients without sacrificing taste or nutrition
  • SAFETY & TRANSPARENCY Natural Balance's 'Feed with Confidence' program tests every batch of food from start to finish, ensuring safety with every bite; Validate bag on our site or call our Customer Care Team of Registered Veterinary Technicians
Bestseller No. 4
Blue Buffalo Life Protection Formula Natural Adult Dry Dog Food, Chicken and Brown Rice 15-lb
  • REAL MEAT FIRST: Blue Buffalo foods always feature real meat as the first ingredient; High-quality protein from real chicken helps your dog build and maintain healthy muscles; Plus they contain wholesome whole grains, garden veggies and fruit
  • FOR ADULT DOGS: BLUE Life Protection Formula adult dog food contains essential proteins and carbohydrates to help meet the energy needs of adult dogs, and features omega three & six fatty acids to promote a shiny coat and healthy skin
  • ANTIOXIDANT-RICH LIFESOURCE BITS: A precise blend of antioxidants, vitamins and minerals carefully selected by holistic veterinarians and animal nutritionists to support immune system health, life stage needs and a healthy oxidative balance
  • A NATURAL DOG FOOD: BLUE dry dog food is made with the finest natural ingredients enhanced with vitamins and minerals; BLUE contains NO chicken (or poultry) by-product meals, corn, wheat, soy, artificial flavors or preservatives
  • PACKAGING MAY VARY: Contains one (1) 15 lb. Bag of BLUE Life Protection Formula Adult Dry Dog Food, Chicken and Brown Rice
Bestseller No. 5
I AND LOVE AND YOU Baked and Saucy Dry Dog Food - Chicken + Sweet Potato - Prebiotic + Probiotic, Real Meat, Grain Free, No Fillers, 4lb Bag
  • Serve Wet or Dry - Serve a classic, tried and true, crunchy bowl of oven-baked kibble or simply add a splash of water to make instant, savory bone broth gravy—chef’s choice. Either way, ya can’t go wrong.
  • Chicken is #1 Ingredient - Since the dawn of time, dogs have loved their protein—so that’s why this dish is packed with delicious bites of the good stuff: USA farm-raised chicken.
  • Protein-Rich - Packed with 28% protein to help build your pet’s muscle and boost their energy.
  • Pre & Probiotics for Easy Digestion - Nature’s mighty little biotics work hard to ensure your pet’s gut is in tiptop shape, and smooth digestion leads to smooth, well, you know...
  • Non-GMO Protein & Produce - We make food with au naturel veggies and fruit—grown from the ground up like the good old days. I.E. None of our ingredients are made in a lab.

The Role of Pet Owners

As pet owners, it’s our responsibility to scrutinize the ingredients in our dogs’ food and make informed choices about what we’re feeding them. While it may be tempting to opt for cheaper dog food options, the long-term health implications for our pets can end up costing more in veterinary bills and reduced quality of life for our beloved dogs. Investing in high-quality dog food without harmful fillers is an investment in our pets’ health and longevity.


Fillers in commercial dog foods are a concern for pet owners who strive to provide the best nutrition for their dogs. By understanding the common fillers used and their potential impacts on dog health, pet owners can make more informed decisions when selecting dog food. Opting for high-quality, nutrient-dense dog food without unnecessary fillers is crucial for maintaining the health, well-being, and happiness of our canine companions.

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