Glossary

Grain-free

A dog food made without wheat, corn, rice or other grains, usually replaced by legumes or potatoes; it is not automatically healthier.

Also called: grain free dog food, no-grain diet, grain-free kibble, wheat-free dog food

Grain-free foods leave out grains such as corn, wheat, rice and barley and substitute starchy ingredients such as peas, lentils, chickpeas or potatoes. They are often sold as closer to a natural diet, but they are not necessarily lower in carbohydrate, and they do not suit dogs better by default.

True grain allergy in dogs is uncommon. Food allergies are more often to proteins such as beef, chicken or dairy. Grains also provide useful nutrients.

Since 2018, the United States FDA has examined reports of the heart disease dilated cardiomyopathy in dogs eating certain diets, many labeled grain-free and rich in legumes. A definite cause has not been established. Many veterinary groups suggest talking to a vet before choosing a grain-free diet and favoring companies that employ qualified nutritionists.

Last reviewed November 8, 2026

In the index now

Related terms

Dilated cardiomyopathy A heart muscle disease in which the heart chambers stretch and the muscle weakens, so the heart pumps poorly; some breeds inherit it. Food allergy An immune reaction to a protein in the diet that usually causes itchy skin and ear problems, and sometimes digestive upset. Kibble Dry, cooked, bite-size pieces of dog food, usually made by extrusion, that are shelf-stable, convenient and the most common way to feed dogs. Limited-ingredient diet A food built around one protein and one carbohydrate source to reduce exposure, often used to look for a food allergy.