Military animals

Military animals are domesticated animals that are used in warfare and other combat related activities. As working animals, different military animals serve different functions. Horses, elephants, camels, and other animals have been used for both transportation and mounted attack. Pigeons were used for communication and photographic espionage. Many other animals have been reportedly used in various specialized military functions, including rats and pigs. Dogs have long been employed in a wide variety of military purposes, more recently focusing on guarding and bomb detection, and along with dolphins and sea lions are in active use today.

Dogs were used by the ancient Greeks for war purposes, and they were undoubtedly used much earlier in history. The Roman Empire, starting with Marcus Aurelius, also used dogs in combat. The Romans trained the Molossian dog (or Canis Molossus) specifically for battle, often coating them in protective spiked metal collars and mail armor, and arranging them into attack formations. During their conquest of Latin America, Spanish conquistadors used Mastiffs to kill warriors in the Caribbean, Mexico and Peru. Mastiffs, as well as Great Danes, were used in England during the Middle Ages, where their large size was used to scare horses to throw off their riders or to pounce on knights on horseback, disabling them until their master delivered the final blow. More recently, canines with explosives strapped to their backs saw use during World War II in the Soviet Army as anti-tank weapons. In all armies, they were used for detecting mines. They were trained to spot trip wires, as well as mines and other booby traps. They were also employed for sentry duty, and to spot snipers or hidden enemy forces. Some dogs also saw use as messengers.

...
Wikipedia