Even though human beings and dogs have the same three senses, such as hearing, sight, and spellings, dogs communicate in general by smelling. Some people don't know a lot of things about dogs' noses and how they work, but smelling is their first sense and how they interpret the world around them. This is also why a deaf or blind dogs can do great, given the right exercises and guidance. Dogs' sense of smell is 1,000-10,000,000 times more sensitive than that of human beings, depending on their breed. That's why they are capable of feeling fear, anxiety or even sadness. Even though the adrenaline hormone is undetectable by peoples' nose, dogs can apparently feel it.
Dogs interpret all the information they need, but they do so by smelling. For example, they can detect an object or an animal, and not by staring at it, as humans do. When they feel an object or a person, they don't just registering a particular smell, but they get the entire story out of it. For example, they can detect the hormone pheromone, which can also be found on fur and skin. They have been even known to be able to feel different illnesses to people, like even cancer. They can understand many things about a human being, another dog or another animal; they can understand their mood or their gender or even though where they have been if they are ready to give birth and much more.
The mucus on dogs' noses helps them smell by picking up scent particles. For instance, when their nose is dry, dogs may lick it in order to help them in scent. More specifically, inside their nose, there are scroll-shaped and bony plates, which are called turbinates. In fact, this particular organ reveals a unique and thick membrane, which consists of cells (scent-detecting), as well as the nerves that transport any information to the brain. Their nose has a small pattern of dimples and ridges, which in combination with the outline of his nostril openings, make up a nose print. Also, dogs can both breath and sniff, which are different functions. When they sniff, with just short breaths, they save individual scents, which are not get exhaled. But when dogs are overheated, their smelling sense is reduced by almost 40%. Moreover, little dogs have in their noses heat sensors, which help them to look for their mother when they are still puppies and especially when their ears and eyes are closed. But these individual sensors don't last long; they disappear as they grow up.