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In addition to completing the function of breathing, the nose is the most sensitive part of the dog’s sensory organs. The dog’s sensory ability is 1 million times faster than that of humans. The sensory organ of most mammals is the olfactory mucosa, which is located in the upper part of the nasal cavity and has many wrinkles on its surface. The animal inhales air and reaches the olfactory mucosa, stimulating the olfactory cells and transmitting them to the sensory nerve core along the olfactory nerves densely distributed in the mucosa to produce sensations.

The area of ​​​​the dog's olfactory mucosa is about four times that of humans. There are approximately more than 200 million olfactory cells in the olfactory mucosa, which is 30 to 40 times that of humans. Humans mainly rely on their eyes to examine physical objects and obtain information, while dogs rely on their noses. Dogs mainly rely on sensory information to identify their owners, distinguish similar genders, occurrence situations, and identify roads, directions, prey and food, etc.

When dogs are familiar with and distinguish real objects, they first show the behavior of sniffing. For example, when giving food to dogs, dogs often have to sniff it several times before deciding whether to eat it. When encountering strangers, dogs always surround them and sniff their scent.

The dog’s agility mainly reflects the following two aspects: one is the sensitivity to smell; the other is the ability to distinguish smell. Some people have found that even when sulfuric acid is diluted to extremes, dogs can still smell it. This sense of agility is also an important reason why dogs have become human survival and working partners among many animals.

The sharp sense of dogs is fully utilized by humans in dense areas. Drug-detecting dogs can find carefully packaged marijuana, cocaine and other drugs in dense parcels and luggage.

Police dogs can identify and track the suspects based on the smell of tools, blood prints, sweat stains, and footprints left at the scene. After storing clothes and shoes worn by people for 2 to 3 months, police dogs can also sniff out the owner of the clothes.

Explosion detection dogs can accurately detect explosives hidden in buildings, vehicles, ships, aircraft and other objects. Rescue dogs can help people find victims buried deep in snow, sand and collapsed buildings.

However, when a dog enters a slumber state, its sensory organs will also enter a dormant state until they wake up.

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