In 2018, the FDA began investigating a potential link between grain-free diets and dilated cardiomyopathy (DCM) in dogs. Since then, the topic has generated enormous confusion among pet owners. Let us separate fact from marketing.
What Is DCM?
Dilated cardiomyopathy is a condition where the heart muscle becomes thin and weak, leading to poor pumping function and eventually heart failure. Certain breeds — Dobermans, Great Danes, Boxers — are genetically predisposed, but the FDA investigation flagged cases in breeds not typically at risk.
The Grain-Free Connection
The FDA found that many affected dogs were eating diets where legumes (peas, lentils, chickpeas) or potatoes were the primary carbohydrate source instead of grains. The concern is not that grains are beneficial in themselves, but that the replacement ingredients may interfere with taurine absorption or amino acid metabolism.
What the Science Says Now
As of 2025, the FDA has not established a definitive causal link, and research is ongoing. However, multiple veterinary cardiology studies have shown that some dogs on grain-free diets develop low taurine levels and DCM that reverses when the diet is changed. This strongly suggests a dietary component in at least a subset of cases.
Our Recommendation
Unless your pet has a diagnosed grain allergy confirmed by a proper elimination diet trial, there is no medical reason to feed a grain-free diet. We recommend feeding a diet manufactured by a company that employs board-certified veterinary nutritionists, conducts feeding trials, and publishes peer-reviewed research. When in doubt, ask us during your next wellness visit.