Anyone who is familiar with dogs knows that there is a slit under the dog's nose. It is not surprising once you are used to it, but there is a reason for its existence. Below, the editor will answer your questions.

There is a slit under the dog's nose, which is related to the dog's physiological structure. This is also to allow the dog to breathe better, and is related to the dog's sense of smell. The dog's sense of smell is very sensitive and requires more attention when raising it.

Dogs belong to the phylum Chordata, subphylum Vertebrates, class Mammalia, subclass Eutheria, order Carnivora, suborder Schizopoda, and canidae. Also known as "dog" in Chinese, dogs are distributed all over the world. Dogs, horses, cattle, sheep, pigs, and chickens are collectively known as the "six livestock". Some scientists believe that dogs were domesticated from gray wolves by early humans, and the domestication time ranged from 40,000 to 15,000 years ago. Known as "man's most loyal friend", it is the most frequently kept pet, with a lifespan of approximately 12 to 18 years [1]. In Chinese culture, the dog is one of the twelve animals in the zodiac, ranking 11th among them.

Dogs have the highest sense of smell among all animals. Blind dogs can use their noses to live like normal dogs. The dog's sensitive sense of smell mainly manifests itself in two aspects: one is the sensitivity to smell; the other is the ability to distinguish smells. The sensitivity will vary depending on the type of smell. The ability of dogs to detect odors is 1 million or even 10 million times that of humans. The ability to distinguish odors is more than 1,000 times that of humans. They can distinguish about 20,000 different odors. Specially trained excellent police dogs can distinguish more than 100,000 different odors.