The dog harness is quite popular among those who have a dog.
It is used regardless of the dog's size, walking conditions, breed and other parameters.
Although it is primarily used because it theoretically puts less pressure on the dog than a flat collar, it creates several problems.
The harness is placed on the strongest part of the dog, its chest. This automatically creates a desire to the dog to pull, since the resistance exerted on him is encouraging and almost never creates discomfort.