Common Pet Health Myths That Vets Wish Would Disappear

This myth likely persists because a dog's nose is distinctly tactile and noticeable. In reality, a dog's nose can be warm and dry after a nap, after exercise, or simply because of low humidity indoors. Conversely, a dog with a serious illness may still have a wet nose. Veterinarians assess health through a full clinical picture — not a single physical characteristic. If you're concerned about your pet's wellbeing, observe their appetite, energy level, and behavior rather than relying on nose condition alone.

Garlic — along with onions, leeks, and chives — belongs to the Allium family. These plants contain compounds called thiosulfates, which damage red blood cells in dogs and cats and can lead to a condition called hemolytic anemia. Cats are especially sensitive. Even small repeated doses can accumulate to dangerous levels. No credible veterinary evidence supports garlic as an effective flea deterrent, and the risks far outweigh any purported benefit. Speak with your veterinarian about safe, proven flea prevention options.

The idea that a dog's mouth has healing properties is an old one, but it misrepresents the science. While some antimicrobial compounds do exist in saliva, dog mouths also harbor bacteria such as Pasteurella, Staphylococcus, and Capnocytophaga — organisms that can infect open wounds and, in rare cases, cause serious illness in humans. For the pet itself, persistent licking causes moisture buildup, breaks down healing tissue, and introduces bacteria directly into the wound. Elizabethan collars (the cone) and veterinary wound care remain the appropriate response.

Confinement to indoors removes some risks — traffic, predators, certain infectious diseases — but it does not eliminate the need for routine care. Indoor cats are at elevated risk of obesity and related conditions like diabetes and joint disease, and dental disease is nearly universal in cats regardless of lifestyle. Fleas, ticks, and heartworm larvae can enter the home environment via humans or other animals. Additionally, many vaccines protect against airborne or environmentally stable pathogens. To understand which vaccinations are recommended for low-exposure cats, see our article on how vets decide what vaccines your pet needs.

The seven-year rule was likely derived by dividing average human lifespan by average dog lifespan — a blunt calculation that obscures real biological differences. Dogs mature very rapidly in their first two years (a one-year-old dog is developmentally closer to a young adult than a human child), then age more gradually. Larger breeds tend to age faster and have shorter lifespans than smaller breeds. Researchers have explored more nuanced aging models based on cellular changes, but no single conversion formula applies cleanly across breeds. What matters practically: dogs move through life stages differently than humans, and your veterinarian tailors health monitoring to your specific dog's age, size, and breed.