The dog’s olfactory sensitivity ranks first among the animals, and the eye-catching dog can use the nose to live like a normal dog. The dog’s sensitive sense of smell is mainly manifested in two aspects: one is sensitivity to odor; the other is the ability to distinguish odor. Sensitivity varies depending on the type of taste, about 1200 times the human sense of smell. The dog’s nose can distinguish about 2 million different odors, and it also has a high degree of analytical ability to sniff out the odor it is looking for from many mixed odors. The dog’s ability to sense odor can reach the molecular level.
The hearing sensitivity is up to 120,000 Hz, which is 16 times that of humans. The farthest distance to listen is about 400 times that of people. The dog’s ability to distinguish the direction of the sound is twice that of humans, and it can distinguish 32 directions. It can distinguish the metronome from 96 or 100 vibrations per minute, 133 or 144 times. For human passwords and simple language, dogs can establish conditioned reflections based on pitch syllable changes.
The dog’s eyesight is only about three-quarters of the person’s. In all animal species, the dog’s vision is about medium. The dog’s single eye can only see 25 degrees, so the front distance is not visible. The eyeball of the dog’s eye is relatively large, deformed like a horse’s eyeball, so it is impossible to adjust the sense of distance. Two or thirty meters is about its limit. Dogs have special ability to monitor moving objects; they can detect images moving 70 lines per second, while the average TV line moves about 60 picks per second. When the light is dim, the dog’s vision is better than the human eyesight. The dog is a natural carnivore, born by hunting, so they also have the considerable vision in the dark. The dog’s eyes can see short-wavelength colors. In addition, the dog’s cornea is larger, allowing more light to enter the eye, making it easier to see things in dim light. But in the darkness of all without light, the dog could not see it.