Why Pet Nutrition Myths Are So Persistent
Pet owners want to do right by their animals, and that genuine care makes them vulnerable to confident-sounding claims that circulate online, in pet stores, and among fellow owners. When a myth echoes something that feels intuitive — natural is better, ancestral diets are healthier — it gains staying power regardless of the evidence behind it.
The result is a landscape of well-intentioned but often inaccurate feeding practices. Separating fact from fiction matters, because what goes into your pet's bowl has real consequences for their long-term health. The myth-and-fact pairs below address the most stubborn misconceptions, grounded in current veterinary and nutritional science.
For a deeper look at how food format affects your pet's daily intake, see our guide to dry vs. wet food. And if you find yourself questioning other widely repeated pet wisdom, our article on pet behaviour myths covers similar ground.
Myth
Raw diets are more natural and therefore healthier for dogs and cats.
Fact
Raw diets carry genuine food-safety risks and are not proven to be nutritionally superior to properly formulated cooked or commercial diets.
The appeal of raw feeding often rests on the idea that wolves and wild cats ate raw prey, so domestic pets should too. But domestic dogs have diverged significantly from wolves over thousands of years of coevolution with humans, including adaptations in starch digestion. Raw meat can harbor Salmonella, Listeria, and other pathogens that pose risks to both pets and the people handling their food. Major veterinary organizations, including the American Veterinary Medical Association (AVMA), advise against raw protein diets for these reasons. A raw diet can be balanced, but doing so correctly requires careful planning — it is not automatically a nutritional upgrade.
Myth
Grain-free food is always the healthiest choice for dogs.
Fact
Grain-free diets are not recommended for most dogs, and some have been associated with a serious heart condition called dilated cardiomyopathy (DCM).
The grain-free trend was largely driven by the (incorrect) assumption that grains are fillers or allergens. In reality, true grain allergies are uncommon in dogs — proteins like chicken and beef are far more frequent triggers. More critically, the U.S. Food and Drug Administration (FDA) investigated a possible link between grain-free, legume-heavy diets and DCM in dogs, a condition that affects the heart's ability to pump blood. The relationship is still being studied, but the finding was significant enough to prompt widespread veterinary caution. Dogs with no diagnosed sensitivity have no established reason to avoid grains.
Myth
Cats can eat the same food as dogs if it's in a pinch.
Fact
Cats have distinct nutritional requirements — including taurine and arachidonic acid — that dog food does not adequately supply.
Cats are obligate carnivores, meaning they require specific nutrients found only in animal tissue that their bodies cannot synthesize in sufficient quantities. Taurine deficiency in cats can cause blindness and heart failure. Dog food is formulated for canine needs and does not guarantee these feline-essential nutrients at appropriate levels. Occasional, truly incidental sharing is unlikely to cause immediate harm, but feeding a cat dog food as a regular diet creates real long-term health risks. Always use food labeled and formulated for the species you're feeding.
Myth
Senior pets should always eat less protein to protect their kidneys.
Fact
Most healthy senior pets benefit from maintaining adequate protein intake; restricting protein is only appropriate when kidney disease has been diagnosed.
This myth likely arose from older guidance once applied broadly to aging pets. Current veterinary nutritional science recognizes that senior dogs and cats are actually at risk of losing muscle mass, which adequate dietary protein helps prevent. Protein restriction for kidney health is a legitimate therapeutic strategy — but only after kidney disease is confirmed through veterinary testing. Applying it preemptively to a healthy senior pet may do more harm than good. If your older pet has been diagnosed with a kidney condition, work with your vet to determine the right protein level for their specific case.
Myth
Table scraps in small amounts are a harmless treat for any pet.
Fact
Many common human foods are toxic to pets, and even non-toxic scraps can disrupt nutritional balance or encourage problematic feeding behaviors.
Onions, garlic, grapes, raisins, macadamia nuts, xylitol (found in sugar-free products), and chocolate are among the foods that can cause serious or fatal illness in dogs and cats. Beyond toxicity, regular table scraps can tip a pet's caloric intake out of balance and may reinforce begging behavior. High-fat scraps in particular can trigger pancreatitis in dogs. If you want to share food with your pet, ask your vet which plain, pet-safe options are appropriate and in what quantities — don't assume that what's safe for you is safe for them.
What Sound Pet Nutrition Actually Looks Like
Cutting through the noise comes down to a few reliable principles. First, complete and balanced commercial pet foods — those meeting standards set by the Association of American Feed Control Officials (AAFCO) — are formulated to meet the full nutritional requirements of dogs or cats at specific life stages. That label matters.
Second, individual variation is real. A young, active Labrador has different caloric and protein needs than a sedentary senior cat. Body condition, health status, and life stage should guide portion size and food type far more than blanket rules like "one cup per day" or "always feed raw."
~10%
Recommended treat/extra calorie limit for pets
Veterinary nutritionists generally advise that treats and extras should make up no more than 10% of a pet's daily caloric intake to avoid nutritional imbalance.
~1 in 100
Dogs with true food allergies
Food allergies are estimated to affect roughly 1% of dogs, making grain-free diets unnecessary for the vast majority of the pet population.
Third, supplements are frequently unnecessary when a pet is already eating a complete and balanced diet — and some can be actively harmful in excess. Before adding anything to your pet's routine, consult your veterinarian.
Nutrition myths don't just waste money — they can delay appropriate care or introduce genuine health risks. If you're uncertain about what your pet should be eating, your vet is always the most reliable starting point. For a broader look at what "balanced" really means as a concept, our explainer on balanced diets offers useful grounding.
Always Confirm Dietary Changes with a Vet
Switching your pet to a significantly different diet — whether raw, grain-free, home-cooked, or a new life-stage formula — can have real health consequences if done without professional input. Before making major changes, schedule a conversation with your veterinarian. They can assess your pet's individual health status, flag any risks, and recommend formulations backed by nutritional science rather than marketing claims.
