Border Collies were developed by shepherds along the Anglo-Scottish border to gather and move sheep with speed, focus and very little instruction. A dog named Old Hemp, born in Northumberland in 1893, set the quiet, intense working style the breed is still known for. They're medium-sized, usually 30 to 55 pounds, with a rough or smooth double coat in black and white or many other colors.
That working heritage shows up at home as a need for a job. A Border Collie without enough exercise and mental work may invent its own, like herding children or chasing cars. Shedding is moderate and heavier in spring and fall, and every dog differs in energy, sensitivity and sociability, so spend time with a dog before deciding.