Dogs have a very long history in warfare, beginning in ancient times. From being trained in combat, to their use as scouts, sentries, messengers, mercy dogs, and trackers, their uses have been varied, and some continue to exist in modern military usage.
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The dog (Canis familiaris or Canis lupus familiaris) is a domesticated descendant of the gray wolf. Also called the domestic dog, it was selectively bred from a population of wolves during the Late Pleistocene by hunter-gatherers. Dogs were the first species to be domesticated over 14,000 years ago, before the development of agriculture. Due to their long association with humans, dogs have gained the ability to thrive on a starch-rich diet that would be inadequate for other canids.
Dogs have been bred for desired behaviors, sensory capabilities, and physical attributes. Dog breeds vary widely in shape, size, and color. They have the same number of bones (with the exception of the tail), powerful jaws that house around 42 teeth, and well-developed senses of smell, hearing, and sight. Compared to humans, dogs possess a superior sense of smell and hearing, but inferior visual acuity. Dogs perform many roles for humans, such as hunting, herding, pulling loads, protection, companionship, therapy, aiding disabled people, and assisting police and the military.
An attack dog (also known as a patrol dog or security dog) is a dog trained to attack a person on command, sight, or by inferred provocation. They are used to defend people, territory, or property. Attack dogs have been utilized throughout history and are used today primarily in police and military roles. They have also been involved in a number of dog-related incidents and fatalities.
The German Shepherd, also known in Britain as an Alsatian, is a German breed of working dog of medium to large size. It is characterized by its intelligent and obedient nature.
Its historical role was as a herding dog, for herding sheep. It has since been used in many other types of work, including disability assistance, search-and-rescue, police work, and warfare. It is commonly kept as a companion dog, and according to the Fédération Cynologique Internationale had the second-highest number of annual registrations in 2013.
A mercy dog (also known as an ambulance dog, Red Cross dog, or casualty dog) was a dog that served in a paramedical role in the military, most notably during World War I. They were often sent out after large battles, where they would seek out wounded soldiers, and they were well-suited to the conditions of trench warfare. They carried first-aid supplies that could then be used by wounded soldiers, and comforted dying soldiers who were mortally wounded. They were also trained to guide combat medics to soldiers who required extensive care. Many mercy dogs were trained by national Red Cross societies to serve the country in which the specific society operated. The German army called such dogs medical dogs. As many as 20,000 dogs are estimated to have served as mercy dogs in World War I and World War II, and they have been credited with saving thousands of lives. Such dogs were also used by the United States in the Korean War.