You may be surprised to know that dogs have a long history accompanying man into dangerous territory. Dogs have recorded use in ancient times by the Egyptians, Greeks, Persians, Sarmatians, Baganda, Alans, Slavs, Britons, and the Romans. The first recorded use of a dog in battle dates back to 600 BC.
A military dog is known as an (MWD) or a "Military Working Dog." Roughly 600 MWDs were on active duty in Afghanistan in 2011. MWDs are paired with a single individual called a handler. Most handlers will keep a dog for no longer than a year. Neither usually stays with one another the length of their career.
MWDs are outfitted with tactical gear including cameras and durable microphones designed to go anywhere the dog can go. All the audio and visual information is relayed back to the handler.
The two most popular breeds for MWDs are Belgian Malinois, which are also used by the Secret Service to guard the White House Grounds and the German Shepherd.