The German Shepherd (Canis lupus familiaris) is a medium to large-sized breed of domestic dog. As the name suggests, the breed originated from Germany where it was developed to herd sheep. They are well-known for their high intelligence and are among the most popular dogs that are trained to help people as service and police dogs. Most German Shepherds are red or tan with a black mask and body. Other colors varieties include pure-black, pure-white, sable, blue, and panda.