05/22/2025
No, it does NOT.
LOUDER👏 FOR 👏 THE 👏 PUPPERS 👏 IN 👏 THE 👏 BACK
"In the words of Dr Richard Patton, who has a PhD in Animal Nutrition & 40 years of experience formulating canine diets, 'there is no credible scientific evidence for [grain-free foods causing DCM], let alone proof. If there is a link between diet and DCM in dogs, it is far more likely to be a matter of protein quality, amount, and specific amino acid amount.'"
"Why are you still rating grain-free dog food? It causes Dilated Cardiomyopathy!" ...or does it? 🤔❓
First up, here’s how this controversy started...
In 2018, the FDA started receiving a spike in reports of dogs with Dilated Cardiomyopathy (aka DCM). This is a disease that causes weakened heart muscle contractions, and it can lead to heart failure and early death. Of course, none of us want our dogs to get DCM! 💔
So, when the FDA announced that 90% of reported cases were in dogs eating a grain-free diet, and that 93% of them were eating legume-rich dog food, containing large amounts of lentils & peas, a lot of worried pet parents switched away from these foods. 😳
This is where a lot of people - even vets - have stayed to this day.
The problem is that, when the FDA investigated whether there was a causal link between grain-free diets and DCM, or legume-rich dog foods and DCM, it couldn’t find one. This is why, in 2022, it announced that, after 4 years of study, it had "found no firm link between diet and dilated cardiomyopathy." ❌
But what about those high numbers of dogs eating grain-free foods with DCM? Shouldn’t that be enough to keep you from feeding grain-free foods to your pets? 👀
There are three things to say about this.
First, the reported correlation between DCM and grain-free diets may be misrepresenting the facts. This is because vets were encouraged to report only cases of DCM in dogs eating grain-free diets. 🩺
This is a bit like trying to find out whether watching cartoons causes low IQ by asking teachers to report only cases of kids with low IQ who watch cartoons. 🧠
You see the problem… 🔎 by asking teachers to report in this way, you miss both: kids with low IQs who don’t watch cartoons, and; kids with high IQs who do watch cartoons.
In the same way, vets may have missed cases of DCM in dogs fed grain-inclusive diets (which is easy to do as it can be hard to diagnose). And of course, they won’t have reported the many dogs on grain-free diets in their care who never developed DCM.
In other words, the correlation may be an illusion.
Second, even if the correlation between certain diets and DCM is not an illusion, correlation is not the same as causation. 📈❌
To see this, suppose we found that all and only kids who watch cartoons have low IQs. That’s a correlation. But it’s not the same as the cartoons causing low IQ. It may be that the cartoon-watching kids all eat unhealthy snacks while watching their cartoons, and that it’s the unhealthy snacks that cause low IQ.
This is important because, if you just ban cartoons, you won’t prevent low IQ! 😅
In the same way, if grain-free foods are not the cause of DCM in dogs, avoiding them won’t stop DCM.
Third, some people speak as if it’s easy for pet parents to forego grain-free foods “just in case”. However, not only does this rule out some extremely high quality dog foods, but some dogs do better on grain-free diets, especially those with sensitive stomachs. So why rule grain-free out if there’s no good reason to do so? 🤔
Ok, so what’s the upshot?👀
Our position at Dog Food Advisor is that, since there is no proven causal link between DCM and grain-free diets, we do not downgrade any dog food recipes purely for being grain-free. We believe that taking any other approach, given the lack of evidence of a problem, would be simply unfair. In the same way as it would be unfair to ban cartoons without a proven link to low childhood IQ.
In the words of Dr Richard Patton, who has a PhD in Animal Nutrition & 40 years of experience formulating canine diets, “there is no credible scientific evidence for [grain-free foods causing DCM], let alone proof. If there is a link between diet and DCM in dogs, it is far more likely to be a matter of protein quality, amount, and specific amino acid amount.” 🥩🥼
If after all this, you still feel that avoiding grain-free foods is right for your dog, that is, of course, 100% up to you. We’re here to support pet parents in making informed choices about what they feed to their pets, we’re not here to make those choices for you. 😀
There are actually many more things that can be said about this issue. If you’re interested, you can find lots more information on our website. Start here: 🔗 https://www.dogfoodadvisor.com/canine-nutrition/truth-grain-free-dog-food/