What is the function of your dog's nose?

A dog’s nose has several important functions. First and foremost, your dog’s nose cleans the air it breathes in using the moist inner mucous membrane. This also warms and humidifies the inhaled air. Smelling is, of course, another important function of the nose; dogs have an extremely well-developed sense of smell. Their sense of smell is around 100,000 times better than that of humans, enabling them to detect ingredients and traces. Communication is another function of the nose; dogs ‘read’ scents to gather information about other dogs, animals and people. Think of gender, health and mood. Furthermore, the nose regulates the dog’s body temperature. Dogs do not sweat like humans; their nose helps evaporate moisture, which aids in cooling. Finally, the nose also aids in navigation; they use scents to find their way home, for example.

How does a dog’s nose work?

A dog’s nose is an incredibly powerful and complex organ. They have an extremely sensitive sense of smell; dogs have up to around 300 million olfactory receptors, whereas humans have only about 5 million. In dogs, the olfactory centre in the brain is 40 times larger than that in humans. Dogs can also smell whilst breathing; the air entering the dog’s nose is split in two. One part goes to the lungs, whilst the other is directed straight to the olfactory area (olfactory centre). Dogs have an extra olfactory organ in their palate, which helps them detect pheromones – scent substances from other animals. This is particularly helpful in recognising other dogs, determining their sex and their reproductive status.

How sensitive is a dog’s nose?

A dog’s nose is a million times more sensitive than a human’s. It is their instinct to sniff everything – people, objects, other dogs and much more. During walks, they gather information by sniffing.

How good is a dog’s nose?

A dog’s nose is incredibly good, much better than that of humans. They can detect odours in microscopic quantities. A dog can recognise odours that are 1 in a trillion particles in the air. In practice, this means they can, for example, smell a single drop of blood in an Olympic-sized swimming pool. They can smell soup, for instance, but also the carrots, herbs, onions and other ingredients it contains. What’s even more remarkable is that dogs can smell emotions. Emotions are chemical changes in our sweat and breath, and they can detect them. A dog’s nose is one of the most powerful natural detection systems in existence.

What smells do dogs like?

Dogs love certain smells, such as chamomile oil and peppermint oil, which have a calming effect on them. Apart from the smells that calm them, they naturally also love the smell of food, such as cheese and peanut butter. Dogs naturally also love the smell of their owner; they recognise the scent and find it reassuring.

What smells do dogs not like?

Dogs do not like the smell of citrus fruits and vinegar. These are very strong smells and can put them off. Some people use vinegar in their front gardens to keep dogs away, and some trainers use vinegar to keep dogs away from certain areas where they are not allowed. The smell of cleaning products is unpleasant for dogs; not only is it unpleasant, but it can also be harmful to their respiratory system. This applies to all chemical smells. The scent of other predators, such as the urine of wolves or foxes, deters dogs. This is because these scents often signal danger or rivalry.

Why is a dog’s nose always wet?

A dog’s nose contains glands that secrete moisture, which helps dogs detect smells more effectively. The moisture on their nose captures odours from the air, making it easier for these particles to be transported to the olfactory receptors in their nose. A dog’s wet nose helps them evaporate moisture, which cools their body. Dogs do not sweat like humans, so this is useful on hot days or when they are physically active. A dog’s nose also has a layer of mucus, which protects the dog from infection. The moisture on the nose acts as a barrier against dust, dirt and germs. This reduces the chance of harmful particles entering their body.

How sensitive is a dog’s nose?

A dog’s nose is extremely sensitive and far more powerful than a human’s. Dogs can retain and follow scents. They can detect scent trails that are days or even weeks old, and they can smell whether someone is stressed, scared or happy.

Dog breeds with the best sense of smell

Dogs have the most powerful noses; these dog breeds have the best sense of smell:

• Bloodhound

The Bloodhound ranks number one; they have the best noses. Their sense of smell is so good that their scent trails can even be used as evidence in court.

• Basset Hound

A Basset Hound’s nose is almost as good as that of a Bloodhound, so this dog not only has long ears but also an excellent nose.

• Beagle

Beagles are excellent tracking dogs. They are often used by customs services to detect drugs and contraband.

• German Shepherd

The German Shepherd is one of the most popular tracking dogs used by the police and the army. These dogs not only have a fantastic sense of smell, they are also very intelligent.

• Labrador Retriever

Labradors have an exceptional sense of smell and are very often used as search and rescue dogs or as detection dogs.

• Coonhound (Black and tan/Redbone)

Coonhounds are hunting dogs; they are excellent trackers and can follow scent trails over long distances, even days later.

• Springer Spaniel

These dogs are often used in detection work for explosives and drugs. They have a fantastic nose.

Conclusion: What is the function of your dog’s nose?

A dog’s nose is an extraordinarily powerful and versatile organ that plays a crucial role in the dog’s daily life. As well as detecting scents at a level humans can scarcely imagine, the nose also aids in communication, temperature regulation and navigation. Thanks to their exceptional sense of smell, dogs can recognise scent trails that are days or even weeks old, perceive human emotions and distinguish specific ingredients in food. Certain dog breeds, such as the Bloodhound and the Beagle, have a particularly well-developed sense of smell and are often used for tracking work. In short, the nose is an essential sense for dogs, helping them to interact with the world around them.