犬的嗅觉灵敏度位居各畜之首，眼瞎的狗可以利用鼻子生活的像正常狗狗。犬灵

The dog's sense of smell ranks first among all animals. Blind dogs can use their noses to live like normal dogs. The dog's sensitive sense of smell is mainly manifested in two aspects: one is the sensitivity to odor; the other is the ability to distinguish odor. Sensitivity will vary 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 smell the odor it is looking for from many mixed odors. The ability of dogs to perceive odor can reach the molecular level. For example, when 1 cubic centimeter contains 9000 butyric acid molecules, dogs can smell, and in general, there are about 268 × 10.e + 16 molecules per cubic centimeter of air. Therefore, the concentration of butyric acid experienced by dogs is 3.36 × 10.e-17. When someone dilutes sulfuric acid by 1/10 million, dogs can still sniff, and the olfactory sensitivity to acidic substances is tens of thousands of times higher than humans. <br><br>The eyesight of dogs is only about three-quarters of that of humans. Among all animal species, the eyesight of dogs is about medium. The dog's single eye can only see 25 degrees, so the closest distance to the front cannot be seen. The water crystals of the dog's eyeballs are relatively large and deformed like the eyeballs of a horse, so they cannot adjust the sense of distance. The distance between two and thirty meters is about the limit. Dogs have a special ability to detect moving objects; they can detect images moving 70 lines per second, while the movement of lines on a typical TV screen is about 60 picks per second. When the light is dim, the eyesight of dogs is better than that of humans. Dogs are natural carnivores, born by hunting, so they also have considerable eyesight in the dark. The eyes of dogs can see the colors of short wavelengths. In addition, the cornea of ​​dogs is also larger, allowing more light to enter the eyes, so it is easier to see things in dark places. But in the darkness where there is no light at all, the dog cannot see. <br><br>Dogs are very loyal to humans, which is one of the factors that many people keep dogs.

Dogs have the highest sense of smell sensitivity among animals, and blind dogs can use their noses to live like normal dogs. Dogs' sensitive sense of smell is mainly manifested in two aspects: one is sensitive to odor, and the other is the ability to distinguish odors. Sensitivity varies depending on the type of taste, about 1,200 times the human sense of smell. A dog's nose can identify about 2 million different odors, and it is highly analytical, able to smell the smell it's looking for from many mixed smells. Dogs can perceive odors up to molecular levels. Dogs can sniff when 1 cubic centimeter contains 9,000 butyric acid molecules, and in general there are about 268 x 10.e plus 16 molecules per cubic centimeter of air. Therefore, the concentration of dog-feeling butyric acid is 3.36 x 10.e-17 when someone dilutes one millionth of sulfuric acid, the dog can still sniff out, the sensitivity of the smell of acid is tens of thousands of times higher than that of humans.<br><br>Dogs have only about three-quarters of their eyesight, and of all animal species, the dog's vision is about medium. The dog can only see 25 degrees in its single eye, so it cannot see the nearest distance to the front. The dog's eyewater crystals are relatively large, deformed like a horse's eyeballs, so it is impossible to adjust the sense of proximity, 20 or 30 meters is about its limit. Dogs have a special ability to detect moving objects; they can detect 70 lines per second, while the average TV screen line moves about 60 picks per second. When the light is dim, the dog's eyesight is better than the human's, the dog is a natural carnivore, born by hunting, so they also have considerable vision in the dark. The dog's eyes can see short wavelengths of color, in addition, the dog's cornea is also larger, allowing more light into the eye, so it is easier to see in the dim light. But in the darkness of all light, the dog could not see it.<br><br>Dogs are very loyal to humans, which is one of the factors that many people keep dogs.

The dog's olfactory sensitivity ranks first among all animals. Blind dogs can use their nose to live like normal dogs. The dog's sensitive olfaction is mainly manifested in two aspects: the first is the sensitivity to smell; the second is the ability to distinguish smell. Sensitivity will vary according to the type of taste, about 1200 times that of human olfaction. The dog's nose can distinguish about 2 million different smells, and it also has a highly analytical ability, which can smell the kind of smell it is looking for from many mixed smells. The dog's perception of odor can reach the molecular level. For example, when a cubic centimeter contains 9000 butyric acid molecules, dogs can smell them. In general, there are about 268 × 10. E + 16 molecules per cubic centimeter of air. Therefore, when the concentration of butyric acid in dogs is 3.36 × 10.e-17 and sulfuric acid is diluted by one tenth of a million, dogs can still smell it, and the olfactory sensitivity to acidic substances is tens of thousands of times higher than that of humans.<br>The dog's vision is only about three quarters of that of the human. In all animal species, the dog's vision is about in the middle. The dog's eye can only see 25 degrees, so it can't see the closest distance from the front. The lens of dog's eyeball is large and deformed like that of horse's eyeball, so it can't adjust the distance and proximity. It's about 20-30 meters. Dogs have a special ability to detect moving objects; they can detect 70 moving lines per second, while the average TV picture line moves about 60 lines per second. When the light is dim, the dog's eyesight is better than that of the human. Dogs are born predators and live by hunting, so they also have considerable eyesight in the dark. The dog's eyes can see the color of short wavelength, in addition, the dog's cornea is larger, allowing more light into the eyes, so it is easier to see things in the dim light. But in the darkness for which there was no light, the dog could not see.<br>Dogs are very loyal to humans, which is one of the factors that many people raise dogs.