Dogs recognize their owners by smell, so can they really smell people sick? What do you think?

It should really be possible to smell a person who is sick, mainly because the smell of a person who is sick is definitely different from that of a healthy person who is not sick. That's why dogs can smell.

Yes, it is because the dog's sense of smell is particularly sensitive, and it is particularly familiar with the owner's usual smell, and it can be seen that the dog is particularly loyal and is a good friend of humans.

You really can. Yes, because dogs have very sensitive noses and can smell people, dogs are man's best friend.

Unlike people, dogs do not distinguish things through their eyes, dogs mainly distinguish things through their sense of smell, which is why dogs often sniff and smell on the ground. A dog's sense of smell is about 1,200 times that of a human, and adult dogs have more than 5 million olfactory cells. Most dogs can smell at distances of more than 200 meters.

Dogs that have been trained to do so can even smell more than 1 km away.

The results of relevant studies show that there are only 5 million human olfactory cells, covering a small part of the upper nasal mucosa, with an area of only about 5 square centimeters; The dog's nose has many wrinkles, so the surface area of its nose has increased a lot, the dog's olfactory cells are about 125000 20000, and some breeds have more numbers, for example, the olfactory cells of a sheepdog have 2200000 olfactory cells, and these olfactory cells occupy an area of about 150 square centimeters on the nasal cavity. With so many olfactory cells, dogs are at least a million times more capable of smelling than we humans.

Extended Information: Search and Rescue DogsSearch and Rescue DogsAmong all the categories of working dogs, Search and Rescue is one of the most respected and praised dogs in the popular profession after police dogs. After professional training, they become expert search experts. The dog's ability to distinguish smells is one million times higher than that of humans, and its hearing is 18 times that of humans.

Dogs have a highly developed nervous system, with a sensitive sense of smell, extraordinary hearing, keen vision and other characteristics; There are 100 million olfactory cells in the nose of dogs, which is about 3 million times the ability of human olfaction, and can smell tens of thousands of different smells; Hearing is 16 times that of a human, and it can distinguish sounds in complex environments; Moreover, dogs have well-developed vision and have the ability to see in low light.

Some powerful dogs can smell hundreds of meters away.

How far can a dog smell, the dog's nose is very sensitive, and it is not known how far it can smell.

Dogs have a more sensitive sense of smell than humans because their body structure is better suited to smelling. In dogs, this sense of smell remains keen, while in humans, it seems to be a bit more sluggish. Dogs rely on this sense of smell to find food to eat, to spot enemies, to discern companions, children, and to compete with opponents.

The chemical response to smell is called the constitutional response, and the olfactory organs are called chemoreceptors. However, there are few clues about this function in the structure of the dog's nose, and therefore relatively little is known about how odors are sniffed. Studying dog noses without special structures leads to nerve endings and nerve fibers to the brain, and they are extremely susceptible to damage.

During balanced breathing, the main airflow passes through the fissure. But when mammals inhale, the gas is drawn into the fissure, through a yellowish tissue structure about half a square inch, in which millions of chemoreceptors are embedded. They are long, tiny cells with hairy crowns, which are soaked in mucus on the surface of tissue, forming a web.

They are connected to a part of the brain called the olfactory bulb. The size of the olfactory bulb is a plausible explanation for the sensitivity of the sense of smell.

It is known that dogs have a much larger olfactory bulb than humans. The dog's moist nose also plays a role in its sense of smell.

Dogs are often reluctant to miss any kind of smell, and often consciously sniff the smell, so we understand that the sense of smell is too important for dogs. They keep an eye on the surroundings of their dwelling, smelling the scent of every passerby. For thousands of years, humans have used dogs' keen sense of smell to hunt and track their enemies!

The general distance is 1 2 km.

The difference between different dogs is still relatively large, generally 1 3 kilometers, the ability of dogs to find 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, and can distinguish about 20,000 different smells, and excellent police dogs that have been specially trained can distinguish more than 100,000 different smells.

How far away a dog can smell is sometimes determined by the air, and if there is wind in the environment, he should smell far away.

The dog's sense of smell is the first among all animals, and blind dogs can use their noses to make noise like normal dogs. A dog's sensitive sense of smell is mainly manifested in its sensitivity to odors and its ability to distinguish smells. Sensitivity can vary depending on the type of taste, with dogs 1 million or even 10 million times more capable of detecting scents than humans.

The auditory sense can reach 120,000 hertz, which is 16 times that of humans, and the farthest distance it can hear is about 400 times that of humans. Dogs are twice as good at discerning the direction of sound as humans, and can distinguish 32 directions.

The lens of the dog is twice as thick as that of a human, and its eye adjustment ability is only 1 5 1 3 of a human, and it can be seen clearly within 50m, but it cannot be seen clearly beyond this distance, but the target of movement can be seen at a distance of 825m, and its field of vision is not often wide.

When humans are sick, the human body will release hundreds of volatile organic substances, and when the dog perceives that the owner is sick, it will do some abnormal behaviors, such as the originally gentle dog will bark at the owner for no reason, or be more clingy to the owner, never want the owner to leave, and will do everything to remind you. Generally, dogs' sense of smell is at least 1,000 times that of humans, and some special breeds are even tens of thousands of times more sensitive than humans after training. Dogs can also analyze and identify smells, which is why they can chase prey or work as drug detection and search and rescue dogs.

For us human beings, we may only be able to detect illness through some external realization of our own physical condition, or the advanced technology of the hospital. But for dogs, the subtle changes in the human body can be sniffed by some molecules, which is why dogs can detect the owner's pregnancy or cancer at the first time, and the accuracy rate is as high as 70%.

When humans get sick, the human body releases hundreds of volatile organic substances that smell almost indistinguishable to humans, but are very noticeable to dogs. When the dog perceives that the owner is sick, it will do some abnormal behavior, such as the originally gentle dog will bark at the owner for no reason, or be more clingy to the owner, never want the owner to leave, and they will do everything to remind you when they can't speak. Some specially trained dogs will make special movements to signal as soon as they notice that something is wrong.

The human cancer cells will volatilize an abnormal smell, which will be keenly perceived by the dog, which is also the reason why some owners have just been sick, and the dogs at home will find that the owner is "abnormal", because the owner smells different from before.

The olfactory sensitivity of the wolf dog is more than 40 times higher than that of humans, and its nostrils are long and large, which is suitable for analyzing the fine odors in the air, and some varieties with extremely sensitive sense of smell are even more than 1 million times more sensitive than humans.

The dog's olfactory nerve and cranial nerve are directly connected, and the olfactory nerve is densely trembling in the nasal cavity, and its olfactory sensitivity is very amazing, so police dogs are widely used in various criminal case reconnaissance activities. The results of relevant studies show that there are only 5 million human olfactory cells, covering a small part of the upper nasal mucosa, with an area of only about 5 square centimeters; The olfactory cells of dogs are about 12500 20000, and some breeds have more number, for example, the olfactory cells of a sheepdog are as many as 220000, and these olfactory cells occupy an area of about 150 square centimeters in the nasal cavity.

According to experts, dogs can feel the smell of nuclear incense in different concentrations emitted by 2 million substances. In general, there are 26.8 billion gas molecules per cubic centimeter of air, and as long as there are 9,000 oleic acid molecules in them, dogs can smell it. A few drops of carbonic acid are dropped in a bucket of water, and the dog can tell the difference.

It has also been found that dogs are very sensitive to fatty acids in the sweat of human feet, and if the sweat secreted by each foot of a person is 16 cubic centimeters per day, one thousandth of which penetrates through the soles of shoes, dogs can sniff out human traces.