Border Collies were developed by shepherds along the Anglo-Scottish border to gather sheep with speed, focus and very little instruction. They're medium-sized and agile, usually 30 to 55 pounds, with rough or smooth double coats in black and white and many other colors. Shedding is moderate and heavier in spring and fall.
That working heritage means a Border Collie wants a task. Many are quick learners and stay close to their people, but without daily exercise and mental challenges, a Border Collie may invent its own jobs, like herding kids or chasing cars. A fenced yard helps, yet training and play do the real work. Dogs vary, so look at each dog's actual energy and habits rather than assuming.