The Border Collie originated in the border country between Scotland and England where the shepherds' breeding selection was based on biddable stock sense and the ability to work long days on rugged terrain. As a result of this selective breeding, the Border Collie developed the unique working style of gathering and fetching the stock with wide sweeping outruns. The stock is then controlled with an intense gaze known as "eye", coupled with a stalking style of movement. This selective breeding over hundreds of years developed the Border Collie's intensity, energy and trainability which are features so important that they are equal to physical size and appearance. The Border Collie has extraordinary instinct and an uncanny ability to reason. One of its greatest assets is the ability to work out of sight of its master without commands. Breeding based on this working ability has made this breed the world's premier sheep herding dog, a job the Border Collie is still used for worldwide.
They are widely regarded as the most intelligent dog breed.They are still frequently used on farms all over the world for assisting with the handling of livestock, and they have also become popular as pet and sport dogs.