Dogs have lived beside people for thousands of years, yet many popular beliefs about them are still wrong. Some dog myths are harmless, but others can affect the way we understand, train, and care for our pets.

Below are 10 common dog myths, along with the facts every responsible dog owner should know.

1. Myth: Dogs See Only in Black and White

Dogs do see color. Their color range is simply more limited than ours.

Humans normally have three types of color-detecting cells in their eyes, while dogs have two. Dogs see blue and yellow especially well, but they have difficulty telling red and green apart. A red toy on green grass may not stand out clearly to a dog, even though it looks bright to us.

If you want a toy, training marker, or piece of agility equipment to be easy for your dog to see, blue or yellow can be a helpful choice.

2. Myth: A Wagging Tail Always Means a Happy Dog

A wagging tail shows that a dog is emotionally alert, but it does not always mean the dog is friendly or happy.

Dogs may wag when they are excited, uncertain, nervous, frustrated, or uncomfortable. The meaning depends on the speed and position of the tail, as well as the rest of the dog’s body language. A loose body and relaxed face are very different from a stiff body, fixed stare, or tense mouth.

Never judge a dog’s mood from the tail alone. Look at the ears, eyes, mouth, posture, and situation before approaching.

3. Myth: A Warm, Dry Nose Means a Dog Is Sick

A dog’s nose naturally changes throughout the day. It may become warm or dry after sleeping, exercising, sitting near a heater, or spending time in the sun. Some healthy dogs simply have drier noses than others.

The temperature or moisture of the nose is not a reliable test of overall health. Changes in appetite, energy, breathing, behavior, bathroom habits, or body temperature tell you much more.

Contact your veterinarian if the dry nose is cracked, bleeding, sore, or accompanied by symptoms such as vomiting, weakness, or loss of appetite.

4. Myth: Dogs Eat Grass Only When They Are Sick

Some dogs may eat grass when their stomach feels unsettled, but that is not the only explanation. Dogs may also graze because they enjoy the taste or texture, want more fiber, feel bored, or have developed a habit.

Research summarized by VCA Animal Hospitals indicates that most grass-eating dogs do not appear sick beforehand and do not vomit afterward.

Occasional grazing is often harmless if the grass has not been treated with pesticides, herbicides, or other chemicals. However, sudden or excessive grass eating—especially with repeated vomiting, diarrhea, pain, or poor appetite—should be discussed with a veterinarian.

5. Myth: You Must Be the “Alpha” to Control Your Dog

Dogs do not need to be intimidated, pinned down, or physically forced into submission. These methods are based on an outdated and oversimplified view of wolf behavior.

Harsh “alpha” techniques can create fear, damage trust, and increase the risk of defensive aggression. Dogs learn more safely when owners reward wanted behavior, prevent unwanted behavior from being practiced, and teach clear alternatives.

For example, instead of punishing a dog for jumping, teach the dog that keeping four paws on the floor earns attention. Consistent rules matter, but leadership does not require fear.

6. Myth: You Cannot Teach an Old Dog New Tricks

Dogs can learn throughout their lives. Senior dogs may need shorter sessions, gentler movements, higher-value rewards, or more repetition, especially if they have hearing, vision, memory, or mobility changes.

Learning can be valuable for older dogs because it provides mental stimulation and strengthens their bond with their family. Simple scent games, hand signals, puzzle toys, and low-impact tricks can keep a senior dog’s mind active.

If an older dog suddenly struggles with familiar cues, schedule a veterinary checkup. Pain, hearing loss, vision changes, or cognitive decline may be affecting the dog’s response.

7. Myth: A Dog’s Mouth Is Cleaner Than a Human’s

There is no useful scientific reason to call a dog’s mouth cleaner than a person’s. Human and canine mouths contain different communities of bacteria, and both can contain organisms capable of causing disease.

Dogs also use their mouths to eat, groom themselves, pick up objects, and investigate the environment. A lick on healthy, unbroken skin is usually low risk for most healthy adults, but it is wise to wash your skin afterward and avoid letting dogs lick your mouth, eyes, or an open wound.

Good dental care matters too. Regular brushing with dog-safe toothpaste and veterinary dental checks can help protect your dog’s mouth.

8. Myth: Letting a Dog Lick a Wound Helps It Heal

Licking may briefly remove dirt, but repeated licking can introduce bacteria, irritate tissue, reopen the wound, and delay healing. Persistent licking may turn a small injury into a much larger problem.

If your dog has a wound, contact your veterinarian for proper cleaning and care instructions. An Elizabethan collar, recovery suit, or other vet-approved barrier may be needed to stop licking.

You should also avoid allowing a dog to lick a human wound. Wash the area and follow appropriate medical advice instead.

9. Myth: Shaving a Dog Keeps Them Cooler in Summer

A dog’s coat does more than keep the animal warm. It also helps protect the skin from sunlight and provides insulation from outside heat. Shaving certain coats—especially double coats—may interfere with this natural protection and can sometimes lead to uneven regrowth.

This does not mean every dog should have the same grooming routine. Some coats need regular clipping, while others should usually be brushed and de-shed instead. Ask a veterinarian or qualified groomer what is appropriate for your dog’s breed and coat type.

To prevent overheating, provide shade, fresh water, indoor cooling, and walks during cooler hours. Never leave a dog inside a parked vehicle.

10. Myth: Bones Are Always Natural and Safe for Dogs

Dogs may love chewing bones, but “natural” does not mean risk-free. Cooked bones can splinter and may cause choking, broken teeth, mouth injuries, intestinal blockage, or damage to the digestive tract. Raw bones also carry risks, including tooth fractures and exposure to harmful bacteria.

No chew is completely safe for every dog. The right choice depends on the dog’s size, chewing strength, health, and habits. Ask your veterinarian about suitable chew options, and supervise your dog whenever a chew is offered.

Seek veterinary help promptly if your dog swallows a dangerous object or develops choking, repeated vomiting, abdominal pain, lethargy, loss of appetite, or difficulty passing stool.

Why Dog Myths Matter

Understanding dogs is about more than knowing interesting facts. The beliefs we accept can shape how we respond when a dog is frightened, sick, excited, or trying to communicate.

When advice sounds absolute—“always do this” or “a dog only does that”—it is worth checking a reliable veterinary or animal-behavior source. Every dog is an individual, and sudden changes in health or behavior should be discussed with a veterinarian.

The better we understand our dogs, the safer, healthier, and stronger our relationship with them can become.

Sources and Further Reading

• VCA Animal Hospitals: Do Dogs See Color?
• VCA Animal Hospitals: Interpreting Tail Wags in Dogs
• VCA Animal Hospitals: Why Do Dogs Have Wet Noses?
• VCA Animal Hospitals: Why Dogs Eat Grass
• American Veterinary Society of Animal Behavior: Position Statements
• VCA Animal Hospitals: Can Old Dogs Learn New Tricks?
• American Kennel Club: Is a Dog’s Mouth Cleaner Than a Human’s?
• American Kennel Club: Should Dogs Lick Wounds to Heal Them?
• ASPCA: Should You Shave Your Pet During a Heat Wave?
• American Kennel Club: Can Dogs Eat Bones?

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