Border Collies are athletic, medium-sized herders standing 18 to 22 inches at the shoulder. The overall look is that of a muscular but nimble worker unspoiled by passing fads. Both the medium-length rough coat and the shorter smooth coat come in a wide variety of colors and patterns. The oval eyes are the focus of an intelligent expression—an intense gaze, the Border Collie's famous “herding eye,” is a breed hallmark. In motion, they are among the canine kingdom’s most agile, balanced, and tireless citizens.