The Border Collie is a breed of herding dog that originated along the borders of England, Wales and Scotland. They are widely considered to be among the most intelligent breed of dog. These highly energetic dogs are often considered the world's best sheep herding dogs; they can be hyperactive and are frequently used on farms all over the world to assist with the handling of livestock. While originally bred for farm work, they have also become popular as pet and sport dogs. These dogs can be protective of a human family member and are, most of the time, affectionate to those they know. Border Collies must be carefully trained with a lot of physical exercise and mental stimulation included in their daily schedules.