Border Collies come from the hills along the Anglo-Scottish border, where shepherds wanted a dog that could gather sheep with an intense stare and very little instruction. They're medium-sized, usually 30 to 55 pounds, with rough or smooth double coats that are most often black and white but come in many other colors. Shedding is moderate and heavier in spring and fall, and they often live 12 to 15 years.
That working background shows up as a need for jobs: fetch, agility, trick training, scent games. Many are loyal and closely bonded to their people but reserved with strangers, and herding instinct can mean chasing bikes, joggers or children. Dogs vary, so an adult's actual energy and habits tell you more than the breed label does.