Dogs are known as one of human best friends, and they have an excellent sense of smell. With this special perception, dogs can track prey, find people and discover substances. This also makes the dog perform very well in finding and smelling the owner’s position.

To understand how dogs smell their owners, we must first understand the dog's olfactory system. In fact, dogs’ olfactory system is much more powerful than humans’ olfactory system. According to research, dogs' olfactory system is about 10,000 to 100,000 times more sensitive than humans' olfactory system. This is mainly attributed to the dog's olfactory organs, such as the nasal cavity and olfactory cells. There are a large number of olfactory cells in the nasal cavity of dogs that can detect tiny gas molecules. When a dog sucks air through his nose, odor molecules in the air enter the nasal cavity and come into contact with olfactory cells. Each olfactory cell has many specific receptors that recognize different odor molecules. When combined with a specific odor molecule, the olfactory cells send signals to the brain, allowing the dog to recognize different odors.

This powerful olfactory system allows dogs to identify thousands of odors in a short time and can track and distinguish them. This also explains why dogs are excellent in search and tracking missions, such as finding trapped people in search and rescue operations or tracing prey.

How far can the dog smell the owner? There is no definite answer to this question, as it depends on many factors, including the intensity of the odor, the direction of the wind, the breed of the dog and the degree of training, etc.

First, the intensity of the odor is an important factor in determining the distance a dog can smell his owner. If the owner has a strong smell, such as the owner has just finished exercising, sweating, or applied perfume, it is easier for the dog to smell the owner. Some studies have shown that dogs can smell human scents a mile away.

Secondly, the wind direction also has an important impact on the distance when the dog smells the owner. If the wind blows in the direction of the dog, the dog's perception of the owner's scent is hindered, making it impossible for them to smell the owner. However, if the wind blows in the direction of the dog, the dog has a higher chance of smelling the owner. The breed and training level of dogs will also affect their ability to smell their owners. Some breeds of dogs use their olfactory ability better than others. For example, hunting dogs often have excellent olfactory abilities, and they are well-trained and are often used for tasks such as search, tracking, and mouse hunting. In addition, well-trained police dogs can also find hidden drugs and explosives through their sense of smell.

Although there is no definite answer that accurately tells us how far a dog can smell his owner, what we can be sure is that the dog's olfactory system is very powerful. Dogs can find and identify their owner's location by smelling their owner. However, this ability is affected by many factors, including the intensity of the odor, the direction of the wind, the breed of the dog and the level of training, etc. Anyway, this special ability of dogs makes them one of our best friends and makes us very amazed at their olfactory system.