10 Common Dog Myths That Are Completely Wrong

Myth 1: A Dry Nose Means a Sick Dog

A dog’s nose fluctuates between wet and dry throughout the day. It is often dry after sleeping or in dry weather. Nose moisture is not a reliable health indicator. A sick dog is identified by lethargy, loss of appetite, vomiting, diarrhea, or behavioral changes—not nose texture.

Myth 2: Dogs See in Black and White

Dogs see in color, but their color spectrum is limited. They see blues and yellows clearly but cannot distinguish between red and green (similar to red-green color blindness in humans).

Myth 3: One Dog Year Equals Seven Human Years

This formula is inaccurate. Dogs age rapidly in their first two years (a 2-year-old dog is roughly equivalent to a 24-year-old human), then aging slows. Size also matters: large breeds age faster than small breeds.

For more on this topic, see our guide on Dog First Aid Kit: The Essential Supplies Every Owner Needs.

Myth 4: You Can’t Teach an Old Dog New Tricks

Older dogs learn just as well as younger dogs. They may take slightly longer due to decreased sensory acuity, but their ability to learn new behaviors is intact. Senior dogs benefit greatly from mental stimulation through training.

For more on this topic, see our guide on How Much Exercise Does My Dog Need? (By Breed and Age).

Myth 5: Dogs Eat Grass Because They Are Sick

Most grass-eating dogs are not ill. Studies show that fewer than 10% of dogs show signs of illness before eating grass, and only about 22% vomit afterward. Most dogs simply like the taste and texture.

Myth 6: A Wagging Tail Always Means a Happy Dog

A wagging tail means the dog is emotionally aroused—which could be happiness, excitement, anxiety, or aggression. The speed, height, and direction of the wag provide context.

Myth 7: Dogs Feel Guilt

That “guilty look” when you come home to a destroyed pillow? It is not guilt. It is appeasement behavior triggered by your body language and tone of voice. Studies have shown that dogs display the “guilty look” in response to owner scolding, regardless of whether they actually committed the act.

Myth 8: Pit Bulls Have Locking Jaws

There is no anatomical mechanism in any dog breed that allows the jaw to “lock.” Pit bull-type dogs have strong jaw muscles, but so do many breeds. The locking jaw myth is not supported by veterinary anatomy.

Myth 9: Dogs Should Be Dominant-Submitted (Alpha Theory)

The “alpha wolf” theory that popularized dominance-based training was based on studies of captive wolves that were later debunked by the original researcher, Dr. L. David Mech, himself. Wild wolf packs are family units led by parents, not dictators.

Myth 10: Rescue Dogs Are Damaged Goods

Rescue dogs come from all backgrounds. Many were surrendered due to owner life changes (moving, divorce, financial hardship), not behavioral problems. With patience and proper introduction, rescue dogs make exceptional companions.