Guard dog
Military guard dogs, sometimes called war dogs, are dogs used for military purposes. The US military requries they be 20 inches (51 centimeters) tall at the shoulders and cannot be more than five years old. They cannot be afraid of loud noises including gunfire. They are used for a wide variety of purposes and receive specialized training. Similar to Police dogs they may be used to patrol an area and are used against criminals. They may be used to detect harmful objects such as bombs, mines, harmful gasses and ammunition. Military dogs are trained to watch out for enemies and attack them. The US military used 32 breeds at the start of World War II but by 1944 the list was shortened to five breeds. These were the Belgian Shepherd, German Shepherd, Doberman Pinscher, Collie and Giant Schnauzer.