There are several myths about dogs that, while widely believed, don’t actually hold up under closer inspection. Here are some of the most common ones:
1. A Dog’s Mouth is Cleaner Than a Human’s
- Myth: Many people believe that a dog’s mouth is somehow “cleaner” or more sterile than a human’s.
- Reality: Dogs’ mouths are full of bacteria unique to their diet and environment. While some may be harmless, others can carry harmful germs. Dog mouths aren’t inherently cleaner; they’re just different.
2. Dogs Only See in Black and White
- Myth: Dogs are often thought to see the world in black and white.
- Reality: Dogs actually see colors, but not as vividly as humans. They are thought to see mostly shades of blue and yellow. However, they lack the red-green color spectrum that humans have.
3. Wagging Tails Mean They’re Happy
- Myth: Many assume that a wagging tail is a surefire sign of happiness.
- Reality: While a wagging tail can indicate happiness, it can also signal anxiety, alertness, or aggression. The way a dog wags its tail provides more information. Speed, position, and the rest of the body language tell us what they feel.
4. One Human Year Equals Seven Dog Years
- Myth: The “one human year equals seven dog years” rule is widely believed.
- Reality: The aging process in dogs is more complex and varies significantly based on breed, size, and overall health. For example, larger breeds tend to age faster than smaller ones. A dog’s first two years equate roughly to 12-15 human years. After this period, the rate of aging slows.
5. Dogs Feel Guilty When They Do Something Wrong
- Myth: Dogs supposedly feel guilt, as shown by their “guilty face” when they’re scolded.
- Reality: That “guilty” look is more likely a reaction to your tone. It also responds to your body language rather than an actual understanding of right or wrong. Dogs may appear submissive or act anxious, but they don’t have the same moral reasoning as humans.
6. You Can’t Teach an Old Dog New Tricks
- Myth: It’s often said that older dogs can’t learn new behaviors or tricks.
- Reality: While puppies learn faster, older dogs can definitely be trained. They may require more patience. However, they are capable of learning new tricks and commands at any age if they are healthy.
7. All Dogs Are Natural Swimmers
- Myth: Many people believe all dogs are natural swimmers.
- Reality: While some breeds are built for swimming, others aren’t and may struggle in water. Breeds like Bulldogs, for example, have difficulty swimming due to their heavy bodies. Always supervise dogs around water and introduce them to swimming carefully.
8. Dogs Eat Grass When They’re Sick
- Myth: It’s commonly thought that dogs eat grass to make themselves vomit.
- Reality: Dogs may eat grass for various reasons, including boredom, nutritional deficiencies, or just because they like it. Only a small percentage actually vomit afterward. Eating grass occasionally is usually not a cause for concern.
9. Dogs Shouldn’t Eat “Human Food”
- Myth: Some people believe that dogs should never eat human food.
- Reality: Certain foods, like chocolate, onions, and grapes, are harmful to dogs. However, many other human foods are safe and can even be beneficial. Examples include lean meats, certain vegetables, and plain rice. Always check with a vet, though, to make sure the food is safe.
10. Dog Behavior Problems Stem from Lack of Dominance
- Myth: The idea of “alpha” dominance is misleading. People believe all behavioral problems stem from a lack of human authority.
- Reality: Most behavior issues are more complex. They are usually related to factors like fear, past trauma, or a lack of clear communication and training. Positive reinforcement and understanding a dog’s specific needs are far more effective than asserting “dominance.”
These myths can sometimes lead to misunderstandings about what dogs need and why they behave the way they do. Knowing the truth can help people take better care of their dogs and build stronger relationships with them!
Hena’s Blog For Paws © 2019 by Hena Osman is licensed under CC BY 4.0


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