American Indian Dogs go back to as early as 30,000 years ago, and they are believed to have been widely used by ancient Indians as pack animals, watchdogs, herding and guard dogs. They show resemblance to German Shepherds, but they are smaller, reaching 18-21 inches high at the withers. These dogs are protective and suspicious about strangers, but not vicious. They have wedge-shaped muzzles, erect ears and alert and faraway eyes.