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Is Grain Free Dog Food Better For Dogs?

Written by: Diana Laverdure-Dunetz, MS

Last Updated on February 19, 2024 by Dogster Team

A happy beagle dog rolling around in a corn field with his tongue out.

Is Grain Free Dog Food Better For Dogs?

“Grain” seems to be the five-letter “dirty” word of the dog food world. Mention that you feed your dog some grains, and you may be ostracized from certain forums or Facebook groups. The fact is that every dog is an individual, and no one diet is suitable for an entire species. Are grains in dog food problematic for some dogs? Absolutely. Do others do well on diets that contain some grains? You bet.

Let’s take a closer look at grains and dogs so you can make your own decision regarding what’s best for your canine companion.

First: What are grains?

Grains are the seeds of grasses, called cereal crops, cultivated as food. They are complex carbohydrates made up of starch (long chains of sugar molecules) and fiber. During digestion, the enzyme amylase breaks down starches into simple sugars, such as glucose, for use by the body as energy. Fiber in whole grains is indigestible but provides certain health benefits. Some grains contain gluten, a controversial plant-based protein, while other grains are gluten free.

The most common are:

Gluten-containing grains

Wheat. Photography ©rasilja | Thinkstock.
  • Barley
  • Rye
  • Spelt
  • Wheat

Gluten-free grains

Rice. Photography ©mtphoto19 | Thinkstock.
  • Corn
  • Oats (be sure they are labeled “certified gluten free,” as gluten can creep in during processing)
  • Rice

A separate category called “pseudo-grains” includes the seeds of broad-leaf, bushy shrubs or plants rather than grasses.

These include:

Quinoa. Photography ©mayakova | Thinkstock.
  • Amaranth
  • Buckwheat
  • Millet
  • Quinoa
  • Teff

Wild rice is not really rice but actually an aquatic grass. Grains can be either “whole” or “refined.”

Whole grains have the entire seed left intact, including:

  • Bran. The seed’s hard fiber-rich outer layer, or shell. Rich in B vitamins and trace minerals.
  • Germ. The seed’s core, or embryo. Contains vitamin E, B vitamins, antioxidants, plant-based fats.
  • Endosperm. The biggest part of the seed. Contains starchy carbohydrates and some protein.

Refined grains have had the seed’s bran and germ removed, leaving behind only the starchy endosperm. Refined grains are less nutritious than whole grains and raise blood sugar faster. Brown rice is a whole grain, while white rice is refined.

Can dogs digest grains?

Yes, dogs can digest grains. Although dogs do not produce salivary amylase, they do produce pancreatic amylase, enabling them to digest starches. The latest DNA research shows that most modern dog breeds are traced back to European dogs of about 7,000 years ago. This is the same time that agricultural societies arose, and dogs would have eaten scraps from the farmers’ crops, including corn, sweet potato, white potato, wheat and rice. This agrarian history may explain why modern dogs have more copies than wolves of the AMY2B gene necessary to produce pancreatic amylase. This gene is also 28 times more active in the pancreas of dogs than in wolves.

westie dog eating
Image Credit: Alejandro_Rodriguez, Shutterstock

Why feed grains to dogs?

Dogs can synthesize glucose for energy from fat and protein in the diet; however, this does not mean that grains serve no purpose. Here are some benefits of dietary grains:

  • Fiber from whole grains can help regulate the digestive system, serve as food for the gut’s good bacteria and eliminate toxins from the body.
  • Soluble fiber, such as that found in oats, helps stabilize blood glucose levels, control cholesterol and enhance absorption of nutrients.
  • Whole grains provide a myriad of vitamins and minerals.
  • Grains can reduce a diet’s calorie content while providing satiating fiber, serving a useful purpose in weight reduction.
  • Carbohydrate-based energy from grains benefits dogs with certain medical conditions, such as those with kidney or liver disease who require a protein-reduced diet or those with pancreatitis and intestinal bowel disease that require a low-fat diet.
  • According to Traditional Chinese Medicine, whole grains strengthen the body’s energy, or qi, and blood.
  • Grains provide an economical energy source in home-prepared diets.

How to get the most out of grains in dog food:

Soaking grains in water prior to cooking helps reduce anti-nutrients.
Soaking grains in water prior to cooking helps reduce anti-nutrients. Photography ©aetb | Thinkstock.
  • Soak grains for at least 12 hours prior to cooking to reduce anti-nutrients such as phytic acid, which binds to certain minerals and can reduce their availability.
  • Cook grains well to further reduce anti-nutrients and increase digestibility.
  • Select the type of grain to fit your dog’s needs. Whole grains are more nutritious and won’t spike blood sugar like refined grains; however, they are not appropriate for all dogs. Dogs with gastrointestinal issues typically digest white rice better than brown, while dogs with kidney disease should avoid brown rice due to high phosphorus levels.
  • Avoid corn, wheat and all gluten-containing grains.
  • Never feed genetically modified (GMO) grains.
  • Opt for more nutritious “pseudo-grains,” such as buckwheat or quinoa.
  • Avoid foods that rely on grains as substitutions for high-quality animal protein.
  • Let your dog’s individual needs determine if, and how much, grain to include in the diet.

Problems with grains in dog food

Problems arise when grains substitute for high-quality animal protein. Corn and wheat — two of the top five ingredients known to cause food sensitivities in dogs — are sometimes used in place of more bioavailable animal protein in dog food. Gluten has been implicated in contributing to a variety of inflammatory health issues. For example, Irish Setters from the United Kingdom are predisposed to gluten-sensitive enteropathy, a condition similar to celiac disease in humans.

To avoid problems, grains should be considered in their proper context — as carbohydrates — and used appropriately.

The bottom line about grains in dog food

Unless a dog suffers from intolerances to grains or carbohydrate malabsorption, a small amount of gluten-free grain can serve as part of a healthy diet.

Tell us: Do you feed your dog grains or do you avoid them? What do you think about grains in dog food?

Diana Laverdure- Dunetz, MS, is a canine nutritionist and co-author, with W. Jean Dodds, D.V.M., of two books, including Canine Nutrigenomics: The New Science of Feeding Your Dog for Optimum Health. Their online course, Complete Canine Nutrition, can be found at

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Featured Image Credit: androsov58 | Thinkstock.

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