Alert, active and agile, the Border Terrier is willing to squeeze through narrow holes and sprint across any terrain to capture his quarry: the fox. This persistence made him an excellent working terrier back in England, and allows him to succeed in Earthdog, Obedience and Agilty trials today. Known for his "otter" head and game attitude, the Border is medium-sized with a wiry coat that may be red, grizzle and tan, blue and tan, or wheaten with a dark muzzle.