Well, with this specific product for a dog that pulls right and left, it is the best. A 47-kilogram dog is controlled with the small finger. The difference it makes compared to a regular leash is night and day.
It is not a muzzle. The dog has full mobility and can open its mouth normally, which is why I give it 5 stars. What it does is give you the ability to control the dog with the leash from its muzzle and not from the neck, which is why it is so effective. It is not suitable for dogs with biting tendencies and will not be effective in preventing them from eating food and bones from the street!