As a vet, Dr Rebecca Massie MRCVS, I've heard countless common dog myths from caring owners at my clinic in London, so it's something I want to address at Juno Pets. It's easy to see how this 'dogma' spreads, but separating dog facts vs fiction is vital for your pet's health and happiness. Let's debunk some of the biggest and most frequently asked questions I hear.
What Are the Most Common Dog Myths?
Common dog myths are widely held but incorrect beliefs about a dog's health, behaviour, or biology that are passed down through generations. These pieces of 'common knowledge' often oversimplify complex issues and can sometimes lead to misunderstandings or improper care for our pets.
- Myths about their health (e.g., a warm nose).
- Misconceptions about their senses (e.g., vision).
- Untrue beliefs about body language (e.g., tail wagging).
- Outdated 'wives' tales' about behaviour and training.
In my practice, I find these myths are usually harmless, but some can be detrimental. For example, misinterpreting a dog's behaviour can damage your bond, and ignoring a real health symptom because you're relying on a myth (like the 'clean mouth' one) can delay necessary treatment. That's why it's so important to get to the truth.
Key Takeaway: Common dog myths are widespread but often inaccurate beliefs. Debunking them with facts is key to providing the best care.
Is a Dog's Mouth Really Cleaner Than a Human's?
This is one of the most persistent myths I hear. The short answer is no. A dog's mouth is teeming with its own complex microbiome of bacteria, yeasts, and other organisms. While the *types* of bacteria are different from ours, it is not 'cleaner'.
In fact, research shows that dog and human oral bacteria are very different, and some, like Capnocytophaga canimorsus, can be zoonotic (transmissible to humans), posing a risk to immunocompromised people.
This myth is often linked to another: that you should let a dog lick its wounds to 'clean' them. Please don't! While saliva has some mild antibacterial properties, it's not a sterile solution.
Constant licking introduces oral bacteria directly into the wound, damages the delicate healing tissue, and often makes the problem much worse. This is precisely why we use 'cones of shame' (Elizabethan collars) in the clinic.
Key Takeaway: A dog's mouth is not cleaner than a human's and is full of bacteria. Never let a dog lick its (or your) open wounds.
Does a Warm, Dry Nose Mean My Dog Is Sick?
This is a question I get asked almost every day. Many owners panic when their dog's nose isn't cold and wet, but this is not a reliable indicator of health. The temperature and moisture of a dog's nose can fluctuate dramatically throughout the day. It can be warm and dry simply because they've been sleeping (and not licking it), are a bit dehydrated, or have been lying near a radiator.
Conversely, a dog can have a cold, wet nose and still be very unwell. Instead of fixating on the nose, I tell my clients to monitor for meaningful signs of illness. Look for changes in appetite, energy levels (lethargy), water intake, toilet habits, or the presence of coughing, sneezing, or vomiting.
Key Takeaway: A warm, dry nose is not a reliable sign of illness. Look at your dog's overall energy, appetite, and behaviour instead.
A Vet's Insight: The 'Guilty Look'
A client once came to me, convinced their dog was 'acting guilty' and 'knew' he shouldn't have chewed a shoe. I explained that the 'guilty look' - the 'whale eye' (showing the whites), lowered head, and tucked tail - is actually a powerful appeasement gesture. The dog isn't feeling human 'guilt'; they are reacting to our body language (our anger, stiff posture, and disappointed tone) and are trying to diffuse what they perceive as a threat. It's a classic misinterpretation that can harm our bond.
Does a Wagging Tail Always Mean a Dog Is Happy?
This is a dangerously inaccurate myth. While a relaxed, sweeping "full-body" wag is indeed a sign of happiness, a tail's 'language' is far more complex. A wagging tail simply means the dog is emotionally aroused and willing to interact - but that interaction could be friendly or hostile.
In my clinic, I teach owners to look at the *type* of wag. A high, stiff, fast wag can be a sign of high arousal or a warning. A low, slow wag can signal insecurity or nervousness. You must look at the whole dog-their ear position, body tension, and the wider context-not just the tail. Misreading this is a common reason people get bitten.
Key Takeaway: A wagging tail does not always mean 'friendly'. It signals emotional arousal, which could be anything from joy to anxiety or aggression.
Do Dogs See in Black and White?
This is an old myth that has been thoroughly debunked. Dogs do not see in black and white, but they also don't see the full spectrum of colour that we do. Humans have three types of colour-detecting cones in their eyes (trichromatic vision). Dogs have only two (dichromatic vision), similar to a person with red-green colour blindness.
This means dogs see the world in shades of blue and yellow. Reds and greens likely appear as shades of grey or brownish-yellow. This is why a bright red toy on a green lawn might be difficult for your dog to find, while a blue one would stand out clearly!
Key Takeaway: Dogs are not colour blind. They have dichromatic vision and see the world in blues and yellows, but they cannot distinguish between red and green.
Why Do Dogs Eat Grass?
Many owners assume that eating grass is a sign of nausea or that the dog is trying to make itself sick. While it's true that some dogs will eat grass and then vomit, one study showed that only a small percentage of grass-eaters are unwell beforehand. In my clinical experience, most dogs who eat grass are perfectly healthy.
This behaviour (pica) could be a holdover from their ancestors, who would have ingested plant matter from the stomachs of their prey. It may be a simple source of fibre to aid gut health, or they may just... enjoy the taste or texture. It's generally not a concern unless the behaviour is sudden, obsessive, or accompanied by other signs of illness.
Key Takeaway: Eating grass is normal for many dogs and not always a sign of sickness. It's often harmless, but contact your vet if it's excessive or new.
Is My Dog Trying to Be 'Dominant'?
The 'dominance' or 'alpha' theory is perhaps the most damaging myth I encounter. It's based on flawed observations of captive, unrelated wolves from decades ago. Modern behaviourists know that domestic dogs do not operate in a rigid 'alpha' hierarchy with their human family. Behaviours that owners label as 'dominant' - like pulling on the lead, jumping up, or 'stealing' your spot on the sofa - are almost always an expression of something else: anxiety, excitement, a lack of training, or a learned behaviour that gets them a reward (your attention).
Even games like tug-of-war are not about dominance. It's a fantastic, interactive game that builds confidence and strengthens your bond. The key is to teach a 'drop' or 'release' command, ensuring the human controls the start and end of the game. Please, don't try to 'alpha roll' your dog; it's a terrifying and confusing experience for them and will only teach them to fear you.
Key Takeaway: Your dog isn't trying to be 'dominant'. 'Dominance' theory is outdated; these behaviours are usually due to anxiety, excitement, or lack of training.
Are Mixed-Breed Dogs Healthier Than Purebreds?
This is a common belief. The idea is that mixed-breed dogs (mutts) benefit from 'hybrid vigour' (or *heterosis*), meaning their diverse gene pool makes them less likely to inherit the specific genetic diseases that have become concentrated in many purebred lines. There is some truth to this.
Generations of selective breeding for specific looks or traits have, unfortunately, made certain hereditary diseases (like hip dysplasia in some breeds or breathing problems in others) more common.
However, this doesn't mean a mixed-breed dog is guaranteed to be healthier. They can still inherit problems from their parent breeds, and they are just as susceptible to non-genetic conditions. The best approach for any dog, purebred or mixed, is preventative care and good nutrition.
Key Takeaway: Mixed-breed dogs *may* be less likely to suffer from specific inherited diseases due to 'hybrid vigour', but it's not a guarantee of better health.
Supporting Your Dog's All-Round Wellness
While debunking myths is key, proactive care is what truly matters. In my clinic, I always advocate for a preventative approach to health. That's why I developed a comprehensive supplement to support your dog from the inside out. Juno's Daily all-in-one supplement is formulated with evidence-based ingredients to support their joints, digestion, skin, and coat, helping you provide that foundation of wellness every day.
Frequently Asked Questions About Dog Myths
How do dogs sweat?
Dogs primarily cool themselves by panting, which allows moisture to evaporate from their tongues and lungs. They also have sweat glands, but they are concentrated in the pads of their paws-which is why you might see wet paw prints on a hot day.
Is it bad to let my dog sleep on my bed?
From a veterinary standpoint, as long as your dog is healthy, parasite-free, and you're not an incredibly light sleeper (or allergic), it's perfectly fine. It's a personal choice. It will not make your dog 'dominant' or cause behavioural problems.
Why do dogs hate postmen?
They don't! They react to the 'threat' of someone repeatedly approaching their territory (your home) and then 'retreating' (walking away). This pattern accidentally reinforces the barking behaviour, as the dog thinks their barking 'scared' the postman away.
Is it safe to feed dogs bones?
In my clinic, I advise against it. Cooked bones are brittle and can splinter, causing dangerous internal injuries or blockages. Raw bones carry a high risk of bacteria like Salmonella and E. coli, and can be hard enough to fracture teeth.
Does garlic prevent fleas?
This is a dangerous myth. Garlic is toxic to dogs as it belongs to the Allium family (like onions). It can cause severe damage to their red blood cells, leading to life-threatening anaemia. It is not an effective or safe flea treatment.
Can you teach an old dog new tricks?
Absolutely! Older dogs may learn more slowly and require more patience (and tastier treats!), but they are perfectly capable of learning new commands. It's a fantastic way to keep their minds active and strengthen your bond.
Are dogs carnivores or omnivores?
Unlike cats (who are strict carnivores), dogs are omnivores. Their evolutionary history shows they thrive on a diet that includes both animal protein and plant matter. They have evolved to digest and get vital nutrients from grains, fruits, and vegetables.
How do I calculate my dog's age in 'human years'?
The '1 year equals 7 years' rule is a myth. Dogs age much faster in their first two years. A one-year-old dog is like a 15-year-old human. The AVMA states a 2-year-old dog is about 24, and after that, each year is about 4-5 human years.
Does rubbing a dog's nose in an accident help with house training?
No, never do this. This is an outdated, ineffective, and harmful method. It only teaches the dog to fear you and to hide when they need to go. Positive reinforcement (praising them when they go outside) is the only effective and kind way to house train.
Is it true dogs 'know' when you're coming home?
They are masters of routine and have incredible senses! They likely hear your car's specific engine sound from a distance or learn the subtle environmental cues of your daily schedule (like the heating clicking on). It's more about their amazing hearing and pattern recognition than a 'sixth sense'.
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