The U.S. Food and Drug Administration (FDA) has identified 16 popular dog food brands that may be associated with an increased risk of heart failure in canines. This announcement comes as part of an ongoing investigation into more than 500 reports of canine dilated cardiomyopathy (DCM), a serious condition that causes the heart muscle to weaken and enlarge. While the agency has been monitoring potential links between “grain-free” diets and heart disease since July 2018, this latest report marks the first time specific brand names have been released to the public.
For many pet owners, the news is alarming. These brands include household names often marketed as premium or high-quality alternatives to traditional kibble. Although the FDA is not yet officially recommending that owners stop using these products, the veterinary community is growing increasingly cautious. As the investigation continues, experts are urging pet parents to look beyond marketing trends and focus on the scientific nutritional needs of their furry companions.
Understanding the Link: Grain-Free Diets and DCM
Canine dilated cardiomyopathy (DCM) is a disease of the heart muscle that results in an enlarged heart. As the heart and its chambers become dilated, it becomes harder for the organ to pump blood, often leading to heart valve leaks and fluid buildup in the chest and abdomen—a condition known as congestive heart failure.
Historically, DCM was primarily a concern for large and giant breeds, such as Great Danes, Doberman Pinschers, and German Shepherds. However, veterinarians began noticing a troubling trend: the disease was appearing in breeds not typically predisposed to heart issues, such as Golden Retrievers, Mixed Breeds, Labrador Retrievers, and even smaller breeds like Springer Spaniels and Beagles.
The common thread among many of these unusual cases was a diet high in peas, lentils, chickpea seeds, or potatoes, which are frequently used as carbohydrate substitutes in grain-free formulations.
The 16 Brands Under Investigation
The FDA listed the following brands based on the frequency of DCM cases reported to the agency, ranging from 67 cases down to 10:
- Acana (67 cases)
- Zignature (64 cases)
- Taste of the Wild (53 cases)
- 4Health (32 cases)
- Earthborn Holistic (32 cases)
- Blue Buffalo (31 cases)
- Nature’s Domain (29 cases)
- Fromm (24 cases)
- Merrick (16 cases)
- California Natural (15 cases)
- Natural Balance (15 cases)
- Orijen (12 cases)
- Nature’s Variety (11 cases)
- NutriSource (10 cases)
- Nutro (10 cases)
- Rachael Ray Nutrish (10 cases)
While dry food formulations were the most common in these reports, the FDA noted that raw food, semi-moist food, and wet foods were also represented in the data.
Why Veterinary Experts Are Concerned
Despite the FDA’s current stance of “investigating but not yet prohibiting,” many veterinary cardiologists are taking a more proactive approach. Dr. Anna Gelzer, an associate professor at the University of Pennsylvania School of Veterinary Medicine, advises a cautious shift away from grain-free options.
“When a dog comes to us and we learn it’s on a grain-free diet, we advise switching to a non-grain-free diet,” says Dr. Gelzer. She emphasizes that the “grain-free” trend was driven by consumer marketing rather than nutritional science. “There’s no scientifically proven benefit to grain-free foods, so why take a chance?”
Dr. Gelzer points out that even the ancestors of dogs—wolves—ingest grains through the stomach contents of their prey. Unless a dog has a specifically diagnosed allergy to grains (which is rare, as most allergies are protein-based), there is little medical reason to exclude them.
Silent Symptoms and Early Detection
One of the most dangerous aspects of DCM is its “silent” nature. In many cases, dogs do not show outward symptoms until the disease has progressed significantly. Potential warning signs include:
- Decreased energy or lethargy
- Coughing
- Difficulty breathing or shortness of breath
- Exercise intolerance (tiring easily during walks)
Dr. Gelzer recalls cases where a sick dog was diagnosed, leading the owners to test their second, seemingly healthy dog. Often, that second dog would show early, subclinical signs of decreased heart function. While some dogs improve once their diet is changed and medication is administered, others may not recover, highlighting the importance of early intervention.
Recommendations for Pet Owners
The Pet Food Institute (PFI), which represents the vast majority of U.S. pet food makers, has stated that they are working with nutritionists and veterinarians to understand this complex issue. However, until a definitive cause is found—whether it be a nutritional deficiency or a specific toxin—the burden of choice falls on the owner.
Dr. Bruce Kornreich of the Cornell University College of Veterinary Medicine suggests that owners stick with established brands produced by companies with a long history of scientific research and quality control. “Unless the dog has a documented sensitivity to grains, it’s probably not worth the risk at this point to feed these products,” he notes.
If you are currently feeding your pet one of the 16 brands mentioned, the FDA recommends consulting with your veterinarian before making any sudden changes. A professional can help evaluate your dog’s specific nutritional needs and determine if a diagnostic heart screening is necessary.
Conclusion
The potential link between certain grain-free dog food brands and canine dilated cardiomyopathy serves as a reminder that “natural” or “trendy” labels do not always equate to better health. While the FDA investigation is ongoing, the consensus among many veterinary specialists is to prioritize scientifically-backed nutrition over marketing fads. By staying vigilant for symptoms and working closely with veterinary professionals, pet owners can ensure their companions lead long, heart-healthy lives.
For those concerned about their pet’s health, early detection is key. Always consult a veterinarian if you notice changes in your dog’s energy levels or breathing patterns.
References
- U.S. Food and Drug Administration (FDA): Investigation into Potential Link between Certain Diets and Canine Dilated Cardiomyopathy.
- University of Pennsylvania School of Veterinary Medicine: Clinical reports on DCM and diet.
- Cornell Feline Health Center / Cornell University College of Veterinary Medicine: Expert commentary on veterinary cardiology.
- Pet Food Institute (PFI): Statements regarding DCM and nutritional research.