Tag Archives: dog nose

5 Dog Nose Facts You Probably Didn’t Know

On the surface, your dog’s nose may look wet, wriggling, and cute. But your pup’s nose is actually a powerful device that guides him through his days in pretty impressive ways. Here are some interesting facts about your dog’s sense of smell that prove canines have superior sniffers.

1. Dog’s Nose Has Two Functions

One for smell and one for respiration. A canine’s nose has the ability to separate air.

A portion goes directly to the olfactory sensing area (which distinguishes scents), while the other portion is dedicated to breathing.

2. Take In And Breathe Out Air At The Same Time

When sniffing, dogs noses are designed so that air can move in and out at the same time.

This creates a continuous circulation of air, unlike humans who have to either breathe in or out only.

3. A Special Scent-Detecting Organ That Humans Don’t Have

This is called the vomeronasal organ and it helps canines detect pheromones, chemicals released by animals that affect other members of the same species.

This organ plays an important role in reproduction and other aspects of canine physiology and behavior.

4. Dogs Smell In 3-D

Dogs can smell separately with each nostril.

Just as our eyes compile two slightly different views of the world, and our brain combines them to form a 3-D picture, a dog’s brain uses the different odor profiles from each nostril to determine exactly where smelly objects are in the environment.

5. Smell Up To 100,000 Times Better Than Humans

A dog’s sense of smell is its most powerful sense.

It is so sensitive that dogs can detect the equivalent of a 1/2 a teaspoon of sugar in an Olympic-sized swimming pool.

Diana Ruth Davidson,  Westside Dog Nanny,             Certified Professional Pet Sitter,                            Certified by American Red Cross in Pet First Aid

Pet Sitting,  In-Home Dog Boarding, Dog Walking, Overnights in Your Home, Doggie Day Care.

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A Dog Nose is Even More Powerful Than You Think

I love to go on walks with my dog,  but Apollo and I have very different ideas about what the point of a walk should be. I am out for exercise with a side of sunshine and fresh air. Apollo’s goal is to smell… absolutely everything! This leads to conflict. I want to keep moving and Apollo wants to stop, and then walk, and then stop, and then walk…

We all know that a dog’s sense of smell is better than our own, but do you know just how much better? I recently watched a TED-Ed Lesson that starts with an excellent explanation of just how a dog’s nose works:

As your dog catches the first hints of fresh air, her nose’s moist, spongy outside helps capture any scents the breeze carries. The ability to smell separately with each nostril, smelling in stereo, helps to determine the direction of the smell’s source so that within the first few moments of sniffing, the dog starts to become aware of not just what kind of things are out there but also where they’re located.

As air enters the nose, a small fold of tissue divides it into two separate flows, one for breathing and one just for smelling. This second airflow enters a region filled with highly specialized olfactory receptor cells, several hundred millions (300,000,000) of them, compared to our five million. And unlike our clumsy way of breathing in and out through the same passage, dogs exhale through slits at the side of their nose, creating swirls of air that help draw in new odor molecules and allow odor concentration to build up over multiple sniffs.

But all that impressive nasal architecture wouldn’t be much help without something to process the loads of information the nose scoops up. And it turns out that the olfactory system dedicated to processing smells takes up many times more relative brain area in dogs than in humans. All of this allows dogs to distinguish and remember a staggering variety of specific scents at concentrations up to 100 million times less than what our noses can detect. If you can smell a spritz of perfume in a small room, a dog would have no trouble smelling it in an enclosed stadium and distinguishing its ingredients, to boot.

The video goes on to talk about how our sense of sight and hearing present us with a picture of a single moment in time, while a dog can smell “an entire story from start to finish.” It also explains how the canine vomeronasal organ lets dogs “identify potential mates, distinguish between friendly and hostile animals, and alerts them to our various emotional states. It can even tell them when someone is pregnant or sick.”

I had reached what I thought was a pretty good compromise with Apollo on our walks. He got to dawdle at the beginning, but at all other times he was expected to get his nose off the ground and keep up the pace. Now, I think I’ll give him a few more opportunities to stop and smell the roses, so to speak.

Take a look at this TED-Ed Lesson; it will give you a new appreciation for what your dog can do with his nose.

Dr. Jennifer Coates

Diana Ruth Davidson, Chief Pet Officer and Managing Nanny, Westside Dog Nanny

We offer pet services such as:  Pet Sitting,  In-Home Dog Boarding, Dog Walking, Overnights in your home, Doggie Day Care.

310 919 9372

Making Sense of Your Dog’s 5 Senses


Your dog’s senses allow him to behave and perform in ways nothing short of magical. Dogs perceive the world differently from the way we do – we share the same senses, but with remarkable differences.

The Nose Knows

The first thing your dog does when you walk in the door is sniff your legs. Dogs gather a lot of information from a quick sniff of their environment – both physical and emotional details. He smells where you’ve been and even how the experience affected you. Dogs sniff each other and each others’ secretions constantly, monitoring various physiological and emotional changes on an ongoing basis.
Dogs live in a world of odors. Their sense of smell is their most refined sense; in fact, it is so refined a bloodhound can identify scales of skin shed by humans three days previously. They can also detect drugs in hidden in body cavities, can sniff out rats, termites, bombs, missing persons, bodies drowned or buried in snow or rubble, and even the presence of melanoma cancer. Their noses are about as sensitive as our eyes.
The scrolled, scent membrane inside a dog’s nose is about four times greater in area than the equivalent smell organ in humans. In the dog’s nose, there are over 200 million scent receptors in the nasal folds compared to our 5 million. Moisture on the nose helps to capture scent and transmit it onto odor-sensitive nasal membranes, which cover the nose’s wafer-thin turbinate bones. These bones comprise of convoluted folds, ensuring that the tiniest amount of scent is captured within them.

See, Spot

Have you ever noticed how your dog acts when you are approaching him from a distance? He sees you immediately, and he stops and stares; but it’s obvious that he doesn’t know who is coming toward him. You start talking to him, perhaps calling his name, but he is still unsure, although he will act interested. Finally, when you get close enough to him that he picks up your scent, he will run to you happily.
Your dog trusts his sense of sight the least. However, while smell is his most refined sense, sight is his strongest. Dogs have no good biological reason to identify different colors. Though they can distinguish between certain colors, their color vision is limited and the colors may appear muted to them. Dogs see more clearly than humans do in dim light. This allows for increased movement definition of prey animals. Although their ability to see detail is limited, they are quite exquisitely sensitive to movement, and are able to pick up even very slight movement of hiding prey. A stationary object may not be noticed from a distance, but the dog will see it as soon as it makes a move.

Hear Ye, Hear Ye

You must have experienced the result of your dog’s super hearing ability. You are sitting in your favorite chair reading or taking a nap, with your faithful pet lying at your feet. It’s blissfully quiet – not a sound to be heard. Suddenly your dog leaps to his feet and begins barking loudly, his protective bark, and you run to the window to see who is approaching. But there’s no one there. At least not at first. It takes moments before someone actually comes into view and walks by the house or into the yard.
The dog’s ability to hear is incredibly acute compared to humans. They can hear sounds over a wider range of frequencies and a greater distance than we can. Also, experiments have shown that a dog can locate the source of a sound in about six-hundredths of a second. Their highly mobile ears capture sounds and funnel them down to the eardrum. You might see your dog cock one ear to capture the initial sound, and then use both ears to catch the maximum number of sound waves. Protection and guard dogs use their sense of hearing, along with their sense of smell, to detect possible intruders, sometimes from great distances.

Touch and Go

Touch is the first sense the dog develops and remains a powerfully important sense throughout his life. Mothers begin touching newborn puppies almost immediately after birth by licking and nuzzling. Touch-sensitive hairs called vibrissae, which are capable of sensing airflow, develop above the eyes, on the muzzle, and below the jaws. The entire body, including the paws, is covered with touch-sensitive nerve endings. The physical sense of touch is very sensitive, although dogs do have a high threshold of pain.
Body sensitivity varies among dogs, but most enjoy being stroked around the head, chest and back. The most sensitive nerve endings are along the spine and towards the tail, and dogs show great enthusiasm in pats or extended rolls and slides on the grass.

The Taste Test

Dogs use their large tongues to lap up water, but they have few taste buds in comparison to humans, approximately one for every six, most of them clustered around the tip of the tongue. They can detect sweet, sour, bitter, and salty tastes. However, your dog has no real sense of taste as we know it; he smells rather than tastes. It’s possible that dogs gain more information about food from their sense of smell than from taste. This may account for their desire to for indiscriminate chewing or eating.

How Do They Do That?

Then there all of the other things that dogs can do that seem to defy explanation – a kind of sixth sense. They seem to be able to detect changes in the earth’s magnetic field; they may, to some extent, be able to detect infrared wavelengths of light, a kind of heat that living animals emit; they can detect sudden changes in barometric pressure when a thunder storm is brewing; they can detect vibrations from earthquakes much sooner that instruments; they can find their way home from long distances over unfamiliar terrain. They can even detect your mood.
Do dogs have a sixth sense? Maybe they do. Or maybe, like some believe, it can all be explained by already-known biological mechanisms. However you explain their abilities, dogs and their sensitivities are truly wondrous.

Diana Ruth Davidson, Chief Pet Officer and Managing Nanny, Westside Dog Nanny

We offer pet services such as:  Pet Sitting,  In-Home Dog Boarding, Dog Walking, Overnights in your home, Doggie Day Care.

310 919 9372