The smell of the dog plays a dominant role in perceiving impressions from the outside world and that is why we speak, that the dog is an animal of smell. Our exploration of the world takes place differently, primarily through optical stimuli, ,,at first sight ". If only a dog could think abstractly and express his thoughts in words, he would say something like this about himself: "My worldview, or rather, my olfactory grasp of the world comes from the very first sigh ,,through the nose ", when as a blind pup I feel the mother, when the world seems fragrant or stinking to me”.

That it is so, can be seen when observing a dog running across the field, where his master stands motionless against the backdrop of a tree. Pies, if it runs with the wind, even though he looks this way, he does not see you and continues for so long, until it smells him. Then he suddenly changes direction and is on his way to you, whom he "noticed with his nose". Another example: The Lord stands in a larger group of people dressed in the same way, e.g.. in a company of the army. The assistant guides the dog with a strong wind so that the animal cannot pick up its olfactory sensations. Pies, if he was not used to finding his master under the same circumstances (place and company), pays no attention to the company, even though the distance is small. Then Mr., not moving, with one short beep, he draws the dog's attention to himself. This instant - because his hearing is perfect - reacts to a barely perceptible human, the sound he knows: he runs towards the company and becomes confused for a moment, then either runs his nose in a row, or he sprints around the company, to catch the wind, and he is now directing himself infallibly to his master.

This experience shows the ability to identify a person by smell, regardless of clothing or altered appearance. Thanks to this ability, dogs, specially trained, provide invaluable services in conducting the investigation, they are used to track down criminals and recognize people, which include items left at the site, e.g.. crime or theft.

So the most important organ for a dog to perceive impressions from the outside world is the nose, who in ancient times had been his guide in the search for loot and who had warned him of the dangers of an approaching enemy. This ability ,.perceiving "by the smell of the presence of other beings (animals or humans) used man for his purposes, making the dog a hunting companion, and later using it for the investigative service.

Before getting a dog, who is supposed to smell, it should undergo special tests. If it is stacked, it is not difficult to know in the service, which he performs, whether it really meets the requirements. Pointing dog field trials or working dog examinations serve these purposes. But even in an untrained dog it is relatively easy to assess the sense of smell.

The test is performed as follows. In the courtyard or meadow, a stranger to the dog lines up in several places, at fairly large intervals, several boxes without any distinctive smell, leaking, allowing the wind to pass freely. In one of them some food with an attractive smell is placed, like for example. roasted meat or sausage. Then the young dog is led upwind at some distance from the boxes and its behavior is observed. Obviously, the dog cannot be well fed before this exam, because then his interest in food decreases. You should also avoid everything, which could unnecessarily distract the animal. Therefore, there should be no other animals and as few people as possible on the test site. The handler (HF) leads the dog slowly or relaxed, long cord, without giving him any directions. Nor can he be informed, which box contains the bait, that he will not, intentionally or involuntarily, interfere with the actions of the tested dog. After the distance, from which the dog will get directly to the source of the smell, you can learn the sensitivity of his sense of smell and compare it in terms of this property with other dogs.

There is a certain modification of the described trial consists in this, that part of the scent of the owner absent during the exam is put in the box or basket. Some stranger to the dog brings him to the trial site and leaves him alone. Sooner or later, the dog will start running across the field, and having come near ,,prop” starts to show interest in clothes with a familiar scent. Of course, a few boxes or baskets must be set up here as well, because he will be interested in one subject regardless of his olfactory sensations.

Freshly shot game, abandoned among tall grass, can also be a luring prop for the pointer, but not e.g.. under the only bush in the meadow. To make a sure judgment about the dog's smell, repeat the attempt several times, at intervals of several days. It is a proven thing, that weather conditions, as well as the mental and health condition of the dog affect the efficiency of his sense of smell. You know, that heat and drought have a negative effect, same as desire, fatigue, increased body temperature and any diseases. The dog is well fed, during intensive digestion, a bitch in heat or a dog within the scent range of such a bitch generally show little interest in the olfactory test.

Wanting to tame a newly acquired dog sooner, we use the fact, that in his psyche the most important role is played by olfactory associations. Then we put pieces of clothing infused with our scent on his lair, and give him bread that is worn for some time in direct contact with the body. This can also be used to justify the dog's behavior, who eagerly lies on or near his garments during the master's absence. You could say, that the dog then carries the olfactory image of a friendly person, just as a person fixes a memory of a person in the mind, whose portrait she is watching.