No, grain-free isn't inherently better for most dogs; it's often a marketing trend, and some grain-free foods replace grains with high-carb ingredients (like peas, potatoes, lentils) that can be less nutritious or even linked to health issues like DCM (Dilated Cardiomyopathy) in some cases, though the FDA hasn't proven a direct link, so consulting your vet for a balanced diet tailored to your dog's needs is key.
Summary: vets caution against grain-free diets not because grains are essential per se, but because many grain-free formulations substitute ingredients and formulations that have been statistically linked to heart disease and because formulation and quality-control issues increase risk.
Grain-free diets can lead to health issues like dilated cardiomyopathy (DCM) and taurine deficiency. DCM is a rare heart disease that causes the ventricles of the heart to enlarge, which can lead to congestive heart failure, arrhythmias, and fluid in the lungs or body. Taurine deficiency has been linked to DCM in dogs.
There are a lot of dog and cat foods sold as grain-free with marketing suggesting that feeding no grains is healthier. This is not true and can, in fact, cause illness for some dogs and cats. There is no medical or physiologic basis to feed dogs or cats a grain-free diet.
The healthiest dog food depends on your dog's specific needs, but top veterinarian-recommended brands known for science-backed nutrition and meeting AAFCO standards include Hill's Science Diet, Royal Canin, and Purina Pro Plan, offering options for life stages and health conditions. For sensitive dogs or allergies, limited ingredient diets (LID) from brands like Prime100 (single protein, human-grade) or raw/air-dried diets from Eureka (high meat, organs) are excellent choices, focusing on whole, digestible ingredients for better gut and skin health, but always consult your vet first.
The worst dog foods often contain cheap fillers like corn, wheat, and soy; unspecified "meat meals" or by-products; excessive sugar; and artificial colors/preservatives, with brands like Kibbles 'n Bits, Beneful, Gravy Train, and some Purina/Iams varieties frequently cited for low nutritional quality and questionable ingredients. Focus on avoiding poor-quality protein sources (unspecified meat meals), fillers, artificial additives, and dangerous human foods like chocolate, grapes, onions, and xylitol.
For optimal health, you can rotate between grain-free and grain-inclusive as part of your pet's feeding plan. Rotational feeding gives your dog nutrients that build a healthy body and a healthy gut. So when you're selecting bags and cans of food, including a mix of grain-inclusive and grain-free is a great option!
Dog Food Ingredients to Avoid
Why Your Dog Might Need a Grain-Free or Gluten-Free Diet
Our veterinary panel's No. 1 pick for the best dog food for adult dogs comes from the highly respected Hill's Science Diet brand, which employs veterinary nutritionists, food scientists, and nutrition specialists to not only formulate and balance diets, but to continue science-backed research.
“The FDA is investigating a potential dietary link between canine dilated cardiomyopathy (DCM) and dogs eating certain grain-free dog foods. The foods of concern are those containing legumes such as peas or lentils, other legume seeds, or potatoes listed as primary ingredients.
Look for foods with high-quality, natural flavors that your dog will love.
Brown Rice: Whole grain that provides pets with essential B vitamins, minerals and high-quality complex carbohydrates for energy and fiber.
Dogs with grain allergies react to ingredients like wheat or corn, which their immune system mistakenly treats as harmful. Symptoms often include skin and digestive issues. Itchy skin, ear infections, gas, and soft stools are some of the most common signs of food allergies in dogs.
Onion and Garlic – Allium family vegetables, which includes all onions, leaks, chives, shallots, and garlic are toxic to dogs. These foods contain compounds called disulfides and thiosulfates, which cause damage to a dog's red blood cells when ingested.
What should the first five ingredients in dog food be?
The 90/10 rule for dogs means that 90% of their daily calories should come from a complete and balanced dog food, while only 10% should come from treats, chews, and table scraps, preventing weight gain and ensuring proper nutrition. This guideline helps owners manage treat portions, preventing unbalanced diets and health issues like obesity, joint problems, and diabetes, as treats can be surprisingly high in calories, even healthy ones.
Grain-free dog food has raised concerns due to possible links with dilated cardiomyopathy (DCM), a traditionally genetic, breed-related disorder causing dilation and thinning of the chambers of the heart. This can lead to heart failure, arrhythmias, and sudden death.
There's no single "number 1" healthiest dog food, as the best choice depends on your dog's age, breed, and health; however, look for foods meeting AAFCO standards (Association of American Feed Control Officials), with real meat as the first ingredient, and vet-recommended brands like Hill's Science Diet, Purina Pro Plan, and Royal Canin are often cited for balanced nutrition. Freshly prepared or raw diets can also be healthy but carry risks, so always consult your vet.
Changing your dog's food should happen gradually, over at least one week. For dogs with a particularly sensitive stomach or those who are picky eaters, you may want to extend this food transition to two weeks. For many dogs, a sudden food switch can cause stomach aches, diarrhea, or vomiting, leading to dehydration.
Three toxic types of meat for dogs include fatty, processed meats (like bacon, sausage, ham) due to salt/fat causing pancreatitis and sodium issues; seasoned meats with onions/garlic (allium) that damage red blood cells; and cooked bones, which splinter and cause internal damage or blockages, potentially requiring surgery. Raw meats can also carry harmful bacteria like Salmonella or E. coli.
Heartworm disease is among the top silent killers of dogs and cats, and it's a slow and insidious disease which gradually incapacitates them. By the time pet owners notice the giveaway signs of this disease, serious damage may already have been caused.
What is the Problem? The FDA has become aware of reports of vitamin D toxicity in dogs that ate certain canned dog foods manufactured by Hill's Pet Nutrition and marketed under the Hill's Science Diet and Hill's Prescription Diet brands.
Ingredients to Avoid in Dog Food
Grain-free recipes often incorporate diverse carbohydrate sources like sweet potatoes, lentils, and peas. This variety can provide different nutritional profiles and textures that some dogs find more appealing.