Pet Nutrition Myths That Vets Hear Too Often

The grain-free trend grew from the assumption that grains are cheap fillers with no nutritional value. In reality, ingredients like oats, barley, and brown rice provide digestible carbohydrates, fiber, and micronutrients. Dogs, unlike their wolf ancestors, have evolved amylase activity that allows them to digest starch efficiently.

More significantly, the U.S. Food and Drug Administration launched an investigation into a potential link between grain-free diets and a form of heart disease called dilated cardiomyopathy (DCM) in dogs. While causation has not been confirmed, the association has been taken seriously enough by veterinary cardiologists to warrant caution. For a thorough, up-to-date look at this topic, see what the research currently shows on grain-free pet diets.

The appeal of raw feeding is understandable — minimally processed food resonates with health-conscious owners. However, major veterinary organizations, including the American Veterinary Medical Association (AVMA), have noted that raw meat diets pose contamination risks from pathogens such as Salmonella, Listeria, and E. coli. These bacteria can sicken both pets and the humans who handle their food and clean their bowls.

Beyond safety, published analyses of home-prepared raw diets frequently find nutrient imbalances — too much or too little of critical vitamins and minerals. If raw feeding is something you're seriously considering, consult a board-certified veterinary nutritionist who can help design a formulation that meets your pet's actual needs.

High protein content on a guaranteed analysis panel looks impressive, but not all protein sources are equally usable by a pet's body. Bioavailability — how efficiently a nutrient is absorbed and used — varies significantly between protein sources. An animal protein with a complete amino acid profile may be far more beneficial than a higher-percentage plant-derived protein that lacks certain essential amino acids.

Excess protein is also not without consequence. In animals with certain kidney conditions, high protein intake may need to be managed carefully under veterinary guidance. The comparison of plant vs. animal protein sources explains these differences in detail.

Some human foods — including onions, garlic, grapes, raisins, xylitol (an artificial sweetener), chocolate, and macadamia nuts — are toxic to dogs and/or cats. Even foods that aren't outright toxic can cause digestive upset, contribute excess fat and salt, or displace nutrients from a complete commercial diet.

Occasional small treats of safe foods (plain cooked chicken, for example) are generally low-risk, but making scraps a regular habit shifts the caloric balance in ways that can contribute to weight gain and nutritional gaps. For a reliable reference on which human foods are and aren't safe, see human foods that are safe and not safe for dogs and cats.

Cats are obligate carnivores, meaning they require nutrients — including taurine, arachidonic acid, and preformed vitamin A — that are found only in animal tissue and that their bodies cannot synthesize in adequate amounts. Dogs, by contrast, are omnivores capable of producing some of these compounds themselves.

Feeding a cat dog food over time can lead to serious deficiencies. Taurine deficiency in cats, for instance, is associated with heart disease and vision loss. Always feed species-appropriate food formulated to AAFCO standards for cats. If your cat is a reluctant eater, see why cats refuse food for practical guidance.