Popular Pet Feeding Myths That Vets Frequently Correct

The popularity of grain-free pet food surged on the belief that grains are unnatural fillers that cause allergies or inflammation. In reality, true grain allergies in pets are relatively uncommon, and grains such as rice and oats are digestible energy sources with recognized nutritional value.

More critically, the U.S. Food and Drug Administration launched an investigation into a potential link between grain-free diets — particularly those high in legumes like peas and lentils — and DCM in dogs. Research is ongoing, but the association has been documented across many breeds. Unless a specific grain intolerance has been diagnosed by a vet, grain-free food is not a necessary or automatically safer choice. See what pet food labels actually tell you to better understand how these formulas differ on paper.

The appeal of raw feeding rests on the idea that ancestral diets were raw and therefore optimal. However, domesticated pets — particularly dogs — have undergone thousands of years of physiological adaptation and differ substantially from wild ancestors in their digestive needs.

Major veterinary organizations, including the American Veterinary Medical Association (AVMA), have published position statements discouraging raw protein diets due to pathogen risks. Immunocompromised people, young children, and elderly household members face heightened exposure risk when raw pet food is handled in the home. For a balanced look at the evidence on both sides, our article Raw vs. Cooked Pet Food covers the research in detail.

Feeding a cat dog food long-term — or vice versa — can produce genuine nutritional deficiencies. Cats cannot synthesize taurine in sufficient quantities and must obtain it directly from diet; inadequate taurine causes blindness and heart disease in cats. Dog food is not formulated to meet these feline-specific thresholds.

Conversely, cats generally require higher protein concentrations than dogs, and cat food fed regularly to dogs can contribute to excessive caloric intake and weight gain. The nutritional divergence between these species is explored in depth in Why Cats and Dogs Cannot Share the Same Diet.

Home cooking gives owners a sense of control and transparency, but good intentions do not guarantee nutritional completeness. Studies examining home-prepared pet diet recipes — including those published online — have found that the majority fail to meet established nutritional guidelines. Common shortfalls include calcium-to-phosphorus imbalances, insufficient iodine, and inadequate vitamin D.

If you prefer to cook for your pet, working with a veterinary nutritionist to develop a balanced recipe is strongly advisable. Our related article on nutrients commonly deficient in home-cooked pet meals outlines the most frequently missed gaps in DIY feeding plans.

The word "by-product" carries a negative connotation, but in pet nutrition it refers to parts of the animal other than skeletal muscle meat. Organs like liver and kidney are among the most nutrient-rich components of any carcass, providing concentrated levels of iron, B vitamins, and essential amino acids.

The quality of by-products varies by manufacturer, but the ingredient name alone does not indicate poor nutrition. AAFCO sets definitions and quality standards for ingredients used in pet food. Understanding what these terms mean on a label — rather than reacting to the word itself — helps owners evaluate food more accurately.