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Why Dogs Have a Wet Nose?

3,386 views 路 Published 21 December 2018 路 3:37 路 Indexed 12 November 2026

Channel: Veterinary Network 路 2018 路 Pets & Animals

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Why does the dog always (or almost) have a wet nose? The question seems simple, but the answer is not so much for science. The licks, as well as the mucus, keep the humidity of the snout of the dog and this helps it to cool down. But in addition, water makes the smell reach the animal's brain earlier, while helping it to better capture odors. All this helps so that the sense of smell of the dog is thousands of times superior to the human.

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1. The wet nose of the dog helps you cool down.

 Mucus and licks explain that the dog's nose is almost always wet. "The nasal secretions, as well as the licks, help the dog to keep the humidity in. This constant humidity not only has the ability to help you lose temperature, but also captures many odors.

The wet nose of the dog helps the animal to lose the excess heat of its body, something that it performs, first of all, through its mouth and tongue, thanks to the panting.

The "two lateral nasal glands provide a large part of the water from the nose of the animal". The work of these tiny moisture providers "is essential to prevent the nasal mucosa from drying out when the dog is panting." These spectacular cells that lodge in the interior of the muzzle of the animal have the shape of a tube and drain water to the nostrils, through a conduit that barely opens two centimeters. This explains why the animal's truffle remains soaked.

2. The wet snout makes the smell reach the brain earlier.

A wet canine nose is a sign of health. However, it hides some other secret: the nasal mucus helps it to capture a greater number of odorous particles, so it multiplies its already extraordinary olfactory capacity. This quality explains the important rescue work carried out by some dogs: they can distinguish the trace of a person under meters of rubble.

 The investigation reveals, in this way, that the humidity of the nose of the dog works like a slide, when impelling the passage of the odorous molecules to the brain. It acts as a springboard for hundreds of molecules, imperceptible to the human eye, to reach the receptors of smell and can detect them before anyone else.

3. The mucous of the dog captures smells better.

 The nasal mucus, moreover, acts like a sticky spider web in which millions of tiny odorous molecules get stuck together.

The captured particles activate nerve cells and produce what we know as odor. The dog has millions of olfactory receptors in its snout, although they do not catch all the substances that pass through it. The nose of the dog would work more like a colander: preselect the molecules that it will let pass, while others will be retained in the sticky spider web of the nose.

All these mechanisms, in which humidity plays a key role, explain that the ability to smell of a dog is "thousands of times greater than human".

4. Keys to understanding why the nose of the dog is wet.

The licks, as well as the mucus of the dog, keep its truffle moist.

The inside of the nose of the dog has glands that expel water and prevent the truffle from drying out during panting.

The wet nose of the dog facilitates the arrival of odors to the brain: the mucosa makes the particles slip in its path.

When the humidity of the muzzle captures the particles, olfactory receptors are activated: there are millions in the dog.

All these mechanisms, in which the humidity of the nose is determinant, explain that the olfactory capacity of the dog is thousands of times higher than the human one.

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