Grain-Free Diets Could Put Your Dog at Risk of Heart Disease

The study was recently published in the journal PLOS ONE.

Researchers found dogs eating some of these boutique diets are not making or maintaining enough taurine, an amino acid important for heart health. Taurine deficiency has been known for many years to lead to dilated cardiomyopathy, or DCM, a heart muscle disorder that can lead to congestive heart failure and death.

“Given this recent surge in cases, we need to pay close attention to what we are feeding dogs,” said lead author Joshua Stern, a veterinary cardiologist and geneticist at the UC Davis School of Veterinary Medicine. “Choosing a well-researched dog food that has a healthy nutrient profile backed by expert formulation and research is of paramount importance.”

Stern said while some dog breeds are more genetically prone to a traditional form of DCM, the disease is now showing up unexpectedly in other breeds, such as the golden retriever. The common link unifying these cases is their diets. He began noticing the trend two years ago and is now treating many dogs with nutritionally mediated DCM that were all eating quite similar diets. Last year, the U.S. Food and Drug Administration issued an alert to pet owners and veterinarians about the potential association between the diets and DCM. The FDA continues to research this issue in an effort to help identify the exact dietary factor causing the problem.

Study looked at golden retrievers

Suva, a female golden retriever, was treated at UC Davis. She came out of heart failure after switching diets.

Credit: Jamie Warren

Stern’s research involved 24 golden retrievers with dilated cardiomyopathy and a documented taurine deficiency, representing the largest collection of cases with this condition that has been published. Twenty-three of the 24 dogs diagnosed with DCM had also been fed diets that were either grain-free, legume-rich or a combination.

Stern then prescribed the dogs a diet change and taurine supplementation. As a result, all but one dog improved. Nine of 11 dogs in this group with the most advanced stage of the disease, congestive heart failure, also showed dramatic improvements or no longer had congestion.

“This study helped us confirm that this condition is treatable and avoidable, something that traditional DCM of genetic origins is not,” said Stern.

Stern said consumers who are concerned about their dog’s health, should not naively switch their dog’s diet or simply add a taurine supplement. Instead, consult with your vet as dogs can develop DCM from nutritional origins and not be taurine-deficient. Taurine supplements can also mask the problem and lead to a delay of an important diagnosis.’]

 

DCM cases involve different dog food brands and formulas

Table 2. List of pet food brands with their diet varieties and characteristics.

For each pet food variety, the number of dogs diagnosed with DCM fed this diet and the number of dogs with taurine deficiency fed this diet were listed. G = grain-free diet, L = if a legume is listed as one of the first five ingredients of the diet. Note that one dog on diet 1a is the same dog receiving diet 9m. The one dog receiving diet 8k is the same dog receiving diet 8l. (Click to view larger)
Credit: PLOS One: Taurine deficiency and dilated cardiomyopathy in golden retrievers fed commercial diets

Stern urged pet owners to take a second look at their dog’s diet. Cases of DCM have been reported in dogs eating multiple different brands and formulas of food.

The problem may not be that the diet is “grain-free” or “legume-heavy” but that ingredients are interacting to reduce availability of taurine or that other nutrients are missing or interacting in the formulation.

For example, while a lot of pet owners may not want to see “byproducts” in their dog’s food, often the byproducts contain organ meat like heart and kidney, which are good sources of taurine.

“Pet owners should ask themselves if they’re buying the food because it sounds good to them, or whether it’s right based on veterinary research and evidence,” said Stern. “Staying away from some of the most common marketing gimmicks may help to protect your pet.”

For more information on selecting foods for your pet, Stern recommends that clients consider using the recommendations set by the World Small Animal Veterinary Association for selecting a healthy dog food.

Click here for more information on dilated cardiomyopathy and dog food.

Co-authors of the study include Andrea Fascetti and Jennifer Larsen, veterinary nutritionists with the UC Davis School of Veterinary Medicine, and Joanna Kaplan, a veterinary cardiology resident in the UC Davis Veterinary Medical Teaching Hospital.

Dog foods included in the study:

• ACANA Singles Limited Ingredient Diet Pork & Squash Formula (dry)
• ACANA Singles Limited Ingredient Diet Lamb & Apple Formula
• ACANA, unknown variety
• Taste of the Wild Pet Food Pine Forest Canine Recipe with Venison & Legumes (dry)
• 4health Grain Free Beef & Potato Formula (dry)
• 4health Grain Free Chicken & Vegetable Formula (dry)
• Zignature Lamb Formula Limited Ingredient (dry)
• Instinct Limited Ingredient Diet Grain-Free Recipe with Real Lamb (dry)
• NutriSource Grain Free Chicken and Peas Formula (dry)
• Kirkland Signature Nature’s Domain, Turkey Meal & Sweet Potato Formula for Dogs (dry)
• Fromm Lamb & Lentil Recipe Dog Food (dry)
• Fromm Salmon a La Veg (dry)
• Orijen Regional Red (freeze-dried medallions)

Contacts and sources:
Amy Quinton