The Border Terrier is built to be big enough to keep up with hunters on horseback and small enough to squeeze into tight spaces.
Males weigh 13 to 15.5 pounds; females 11.5 to 14 pounds. They stand 10 to 11 inches.
The Border Terrier has a short, dense undercoat covered with a wiry topcoat. His skin is thick and loose — something that came in handy during his fox-hunting days, as it protects him from bites.