The DCM and Grain-Free Pet Food Debacle – Was It Only Bad Science or Shameless Greed & Fraud?

The DCM and Grain-Free Pet Food Debacle

Was It Only Bad Science or Shameless Greed & Fraud?

By Don Hanson, PCBC-A, BFRAP

< A version of this article was published in the February 2023 issue of Downeast Dog News>

< Updated 02FEB23 >

There is NO scientific evidence to support the claim that feeding your dog grain-free or BEG (Boutique, Exotic ingredient, Grain-Free) diets puts them at increased risk for dilated cardiomyopathy, according to an update on the FDA website on Friday, December 23. 2022.

This is excellent news! People can now feed their pets a grain-free or BEG diet without fear. However, it is also tragic news, as how this investigation was handled was a travesty. It caused financial harm to many small companies. It caused many to lose trust in the FDA, the veterinary community, and the media.

The FDA investigation announced on July 18, 2018, was interpreted by many to conclude that grain-free and BEG pet food were harmful. Unfortunately, the FDA and others involved did not attempt to correct this misinterpretation. While we do not know the exact motivation behind this investigation, an article by revealed an email sent to the FDA in June of 2018 by Dr. Lisa Freeman, a Veterinary Nutritionist at Tufts University. In my opinion, the language in Freeman’s email suggests her intent. Freeman requested that veterinarians report cases of DCM to the FDA “If patient is eating any diet besides those made by well-known, reputable companies or if eating a boutique, exotic ingredient, or grain-free (BEG) diet.

Dr. Freeman’s email troubles me. Excluding diets made by what Freeman calls “reputable companies” is poor science. A scientific study would look at food from all manufacturers. Additionally, implicating guilt without evidence is unethical. Her email also suggests that, at least to Freeman, this investigation goes beyond grain-free foods to foods that include non-traditional animal proteins and foods she has labeled as BEG diets.

Dr. Freeman fails to define “reputable companies.” However, an article authored by Dr. Freeman in JAVMA in December of 2018 indicates both Nestlé Purina PetCare, and Royal Canin have funded her research. Therefore I believe it is fair to conclude that they are among the “reputable” companies she has pre-judged as innocent. Was Freeman’s bias against the small, independent pet food companies related to who funded her research? That is something that most definitely warrants an investigation.

The FDA and the veterinarians that initiated this “investigation” were not the only ones complicit in this farce. The national and local news media latched on to both FDA announcements like flies on dog feces. Without fact-checking and an apparent presumptive and undeserving trust of the FDA and Tufts University, the media reported the story, never asking the critical questions asked by others. Instead, the press parroted back Dr. Freeman’s words, making the term “boutique, exotic ingredient, or grain-free (BEG) diet” part of the new pet food vocabulary. By doing so, they severely damaged the reputation of many companies making grain-free and BEG foods. Moreover, they found them guilty and punished them before the FDA proved its case. Now that they have been found not guilty, will the FDA, Dr. Freeman, and the media compensate them for their loss?

The veterinary community at large, possibly the one who cares for your pet, was from the beginning singing from the FDA/Freeman hymnal, proselytizing that ignorant pet parents must avoid feeding BEG diets and should only feed food made by “reputable companies.” Unfortunately, some veterinarians and their staff were not only telling this to people in person but posting it on their websites, where in some cases, these false statements still exist today, in January of 2023. Veterinarians are supposed to be scientists, but they acted like sheep in this case.

On December 1, 2018, the Journal of the American Veterinary Medical Association, an organization of alleged scientists dedicated to healing and the scientific method, posted an article by Dr. Freeman, Diet-associated dilated cardiomyopathy in dogs: what do we know? The title is ironic because many who read it believed it presented facts that BEG diets cause DCM. Evidence supporting that allegation did not exist when the article was published and was dismissed in the FDA’s announcement on December 23, 2022. While the article was published in the Commentaries section of JAVMA, many who read it seemed to view and share it with the same reverence they would give to an article that had been independently peer-reviewed. If JAVMA had acted responsibly, they would have issued a retraction immediately.

Almost a year later, on June 27, 2019, the FDA announced an update to their investigation that named 16 dog food brands that may, according to the FDA, cause DCM in dogs. Within days this report was criticized by leading veterinarians and animal nutritionists. Dr. Jean Dodds stated, “This release has caused national and international concern bordering upon hysteria, without any admitted reason for listing these food brands. In our opinion, the listing of specific brands was premature and unwarranted.” Dr. Dodds also noted:

“In essence, we agree with the FDA that the association between diet and DCM in dogs is a complex scientific issue that may involve multiple factors. However, we think the FDA is causing public panic and overt veterinary concern by not presenting definitive conclusions but implying risk by inference in listed certain pet food brands.” [Emphasis added]

“Why is the agency not requesting the same laboratory work of healthy dogs without a known breed disposition for DCM that are eating grain-free diets? Thus far, this sample size seems relatively small and a control group is nonexistent.” [Emphasis added]

“Why is the agency not actively requesting laboratory work of dogs diagnosed with DCM, without a known breed disposition to DCM, and that were eating grain-containing diets at the time of diagnosis?” [Emphasis added]

On July 30, 2019, Ryan Yamka, Ph.D., a board certified companion animal nutritionist, asked the following questions about the FDA’s investigation in his article ‘BEG’ pet food does not equal DCM:

 “In addition, FDA reported all pet food brands named in DCM reports submitted to the agency. Unfortunately, they only graphed the top 16 brands, and this is what took over the headlines in the press. If the press and others took the time to actually review all the cases reported to FDA (submitted through April 30, 2019), they would have seen other brands like Purina ONE, Hill’s Pet Nutrition, Halo, V-Dog, Lotus and others. What is more important is that the majority of brands named in the report are not boutique brands and can be found in large pet specialty, grocery, and mass market stores. Thus, the “B” in BEG is inaccurate and a misnomer.” [Emphasis added]

“Of the cases investigated, 75% were common protein sources (chicken being No. 1), 24% were novel protein sources and 1% were vegetarian foods. In case you were wondering, kangaroo was only 9.3% of the total cases. Thus, the “E” for exotic in the acronym BEG is also inaccurate and a misnomer.” [Emphasis added]

 “In short, if we continue to misinform the public and the veterinary community to look at only boutique, exotic protein and grain-free foods, we may never identify the root cause of these DCM cases, if one exists. The veterinary community should lose the mind-set that they are caused by so-called BEG foods. Instead, if signs of DCM do exist, veterinarians should go through the battery of tests to confirm the presence of DCM and report it regardless of what the dog is consuming.” [Emphasis added]

 The Journal of Animal Science published “Review of canine dilated cardiomyopathy in the wake of diet-associated concerns” in June 2020. Below I have highlighted essential parts of this paper.

“For example, boutique diets, defined as produced by a small manufacturer, have been implicated in association with DCM (Freeman et al., 2018; FDA, 2019a). However, when the FDA report is broken down into which pet food manufacturers made the called-out diets (FDA, 2019a), 49% of the brands listed were made by one of the six largest pet food manufacturers in North America (Petfood Industry, 2019). Given that almost half of the brands listed on the FDA report (FDA, 2019a) on June 27, 2019, are not manufactured by boutique pet food companies (Figure 5), it is unlikely that an association can be made to DCM.” [Emphasis added]

“The FDA figure lists the top seven proteins of the implicated diets: chicken, lamb, salmon, whitefish, turkey, beef, and pork. These comprised 76% of the diets named in the FDA report (FDA, 2019a), which are not exotic pet food proteins (Case et al., 2011).” [Emphasis added]

The conclusion of this paper says everything we need to know about the FDA’s investigation, and the only logical conclusion is from a scientific perspective; the research was seriously flawed.

“Recently, a correlation between diets with specific characteristics, such as, but not limited to, containing legumes, grain-free, novel protein sources and ingredients, and smaller manufactured brands to DCM has come under scrutiny by academic researchers and the FDA. The use of the acronym “BEG” and its association with DCM are without merit because there is no definitive evidence in the literature. At this time, information distributed to the veterinary community and the general public has been abbreviated synopses of case studies, with multiple variables and treatments, incomplete medical information, and conflicting medical data and opinions from veterinary nutrition influencers. Also, in past literature, sampling bias, overrepresentation of subgroups, and confounding variables in the data weaken this hypothesis. Additionally, based on current literature, the incidence of DCM in the overall dog population is estimated to be between 0.5% and 1.3% in the United States. However, the FDA case numbers (560 dogs) are well below the estimated prevalence. Therefore, it is impossible to draw any definitive conclusions, in these cases, linking specific diets or specific ingredients to DCM.” [Emphasis added]

On September 29, 2020, Kansas State University hosted a virtual Scientific Forum Exploring Causes of Dilated Cardiomyopathy in Dogs. The symposium intended to allow scientists to present their research on DCM and its relations to grain-free or BEG diets. One of the facts discussed, as noted in “Did Industry Funding Influence an FDA Investigation into Canine Heart Disease and Grain-Free Dog Food?” was “…there are an estimated 77 million pet dogs in the US, and most have been consuming pet food of all types without developing DCM.” The symposium concluded, “FDA has no definitive information indicating that the diets are inherently unsafe and need to be removed from the market, but we are continuing to work with stakeholders in assessing how the diets may interact with other factors that may be impacting non-hereditary DCM.” This was over two years before the FDA’s announcement on December 23, 2022, reaching the same conclusion. So why the delay in announcing that grain-free and BEG foods were not the problem?

In July of 2022, 100REPORTERS-New Journalism for A New Age published an investigative article titled Did Industry Funding Influence an FDA Investigation into Canine Heart Disease and Grain-Free Dog Food? by Helen Santoro. This article asks the questions the media should have been asking in July of 2018. I have highlighted a few quotes from the article below, but if you care about what you feed your pet, I recommend you read this article in its entirety.

“A six-month investigation by 100Reporters has found that veterinarians who prompted the FDA to consider diet have financial and other ties to the leading sellers of grain-inclusive pet foods. Additionally, agency records show that for the initial study, some vets were instructed to submit only dilated cardiomyopathy (DCM) cases that implicated grain-free, “exotic” or “boutique” pet foods. Suppliers of ingredients used in grain-free dog foods have also exerted pressure on the FDA to protect their market.” [Emphasis added]

“FDA records obtained under the Freedom of Information Act, however, indicate that those reports may not have been fully representative of cases seen at the Tufts clinic.”

“Freeman has a long history of receiving funding from pet food companies, including Nestlé Purina Petcare, Hill’s Pet Nutrition, and Mars Petcare. This is common within the field of animal nutrition, as a large portion of funding for studies on pet food and nutrition come from big pet food companies”. [Emphasis added]

“Purina, Hill’s and Mars produce some of the most popular grain-inclusive dog foods, including Purina Pro Plan and Purina ONE, Hill’s Science Diet and IAMS Proactive Health (IAMS is owned by Mars). They all also sell grain-free diets. However, grain-inclusive foods are key drivers of dry dog food sales across the industry.” [Emphasis added]

If the intent of the FDA investigation into DCM and grain-free foods was to damage the small pet food manufacturers, they were successful. Those small companies were the innovators who introduced grain-free formulas as a response to dogs that were intolerant to the cheap grains and more common proteins, such as chicken, used in so many dog foods. Unfortunately, as reported by Nielsen IQ: “ grain-free dry dog food has been on a steady decline since June 2018….” and “Brands who were named directly in the FDA’s investigation experienced steeper declines up until the last half of 2020.” The small, independent companies have been the real innovators in pet food for the past two decades. So was the FDA investigation initiated by the big companies to shut that down? It’s a question I have asked myself every day since July 2018.

On Friday, December 23, 2022, the US Food and Drug Administration (FDA) indicated that it is ending updates on its four-and-a-half-year investigation into dilated cardiomyopathy (DCM) and grain-free pet food because the data does not support its previous assertion that the feeding of grain-free pet foods causes DCM. As stated by Debbie Philllips-Donaldson of “It’s a classic PR tactic: releasing less-than-positive news on a Friday in hopes it will go unnoticed leading into the weekend. In the case of the Food and Drug Administration’s (FDA) announcement that it is ending updates on its dilated cardiomyopathy (DCM)/grain-free pet food investigation “unless there is meaningful new scientific information to share,” the news came out the Friday before Christmas, effectively burying it over the long holiday weekend and season.” Let’s hope that the news media and the veterinary community are not as complicit in burying this debacle as they were in promoting it.

I believe in science. It can be the epitome of knowledge when it’s not biased by personal ambition or profit. But science is not infallible. Sadly, big businesses can and have suppressed or twisted science (tobacco, sugar, oxycodone, annual vaccines for pets, and now DCM, and grain-free dog food?) for financial gain throughout history. In this case, those who presented false claims about specific types of pet food without first having scientific evidence to support their claims have disgraced themselves and their profession. Moreover, they have given us ample reason to mistrust and doubt them for a very long time.

Recommended Resources

Online References

June 4, 2018 – A broken heart: Risk of heart disease in boutique or grain-free diets and exotic ingredients, Lisa Freeman Tufts Nutrition Services

July 12, 2018 – FDA Investigating Potential Connection Between Diet and Cases of Canine Heart Disease, –

December 1, 2018 – Diet-associated dilated cardiomyopathy in dogs: what do we know?, American Veterinary Medical Association, –

June 27, 2019 – FDA Investigation into Potential Link between Certain Diets and Canine Dilated Cardiomyopathy

June 28, 2019 – USA Today Your dog may be at risk for developing heart disease based on their food, FDA says

July 8, 2019 – Hemopet Responds to the FDA Implicating 16 Brands of Dog Food That May Cause Heart Disease in Dogs –

July 26, 2019 – Bad Science and Financial Conflicts of Interest Plague the FDA’s Investigation Into “Grain-Free” Pet Foods and Dilated Cardiomyopathy

July 30, 2019 – ‘BEG’ pet food does not equal DCM, Pet Food –

June 2020 – Review of canine dilated cardiomyopathy in the wake of diet-associated concerns, Journal of Animal Science –

June 22, 2020 – New Study Suggests FDA Has Some Serious Explaining To Do Regarding DCM-Truth About Pet Foods –

September 29, 2020 – FDA Update on dilated cardiomyopathy: Fully and partially recovered cases, Kansas State University’s Scientific Forum Exploring Causes of Dilated Cardiomyopathy in Dogs –

March, 17 2022 – Incidence of Canine Dilated Cardiomyopathy Diagnosed at Referral Institutes and Grain-Free Pet Food Store Sales: A Retrospective Survey –

July 2022 – Did Industry Funding Influence an FDA Investigation into Canine Heart Disease and Grain-Free Dog Food?-Helen Santoro 100Reporters –

December, 23rd, 2022Questions & Answers: FDA’s Work on Potential Causes of Non-Hereditary DCM in Dogs –

January 9, 2023 – FDA Halts DCM Updates, Citing Insufficient Data on DCM Cases and Pet Foods – Pet Product News

Articles & Podcasts on Don’s Blog

Words, Woofs and Meows Blog logoJuly 12, 2018 – Grain-Free Foods and FDA Reports of Increased Heart Disease in Dogs

September 29, 2018 – UPDATE! – Pet Nutrition – Grain-Free Foods and FDA Reports of Increased Heart Disease in Dogs – WDJ Blog Post –

September 29, 2018 – Podcast – Is Feeding A Grain-Free Food to Our Dogs Dangerous?, with Linda Case, MS

April 12, 2019 – Shared Blog Post – FDA Updates on Heart Disease in Dogs – Hemopet – Dr. Jean Dodds

July 7th, 2019 – FDA Update on Heart Disease in Dogs & What Should You Do?

July 17, 2019 – Shared Articles – More on the FDA, DCM, and Pet Food

July 20, 2019 – Podcast – Pet’s in the News–No. 4 Pet Food, DCM and The FDA

July 31, 2019 – Shared Articles – Do the Vets Behind the FDA Investigation Have A Conflict of Interest?

August 8, 2019 – Podcast – DCM, the FDA, and Dog Food-the Science and the Hype with Canine Nutritionist Linda Case

June 18, 2020 – Shared Article – Researchers Find No Definitive Link Between DCM and Grain-Free Diets

February 11, 2021 – FDA Concludes “…there is nothing inherently unsafe about a grain-free diet.”

March 28, 2021 – Pet Food Myths & Facts – No. 1, MYTH – Only a Board-Certified Veterinary Nutritionist is qualified to formulate pet food

Don Hanson lives in Bangor, Maine, where he is the co-owner of the Green Acres Kennel Shop ( and the founder of, an online educational resource for people with dogs and cats. He is a Professional Canine Behavior Consultant (PCBC-A) accredited by the Pet Professional Accreditation Board (PPAB) and a Bach Foundation Registered Animal Practitioner (BFRAP). Don is a member of the Pet Professional Guild (PPG), serving on the Board of Directors and Steering Committee and chairing the Advocacy Division. He is also a founding director of Pet Advocacy International (PIAI). In addition, Don produces and co-hosts The Woof Meow Show podcast, available at, the Apple Podcast app, and this blog. The opinions in this article are those of Don Hanson.

© Donald J. Hanson, All Rights Reserved

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