A guard dog, sometimes called an attack dog,[a] is a dog that is trained to watch for and guard against people or animals who should not be there.[3] Their main job is to keep their owner and the owner's property safe from danger. A guard dog is not the same as a "watchdog". A watchdog will let its owner know that a stranger is coming by barking. Guard dogs, however, may be trained to attack if their owner tells them to.[b] A guard dog may also be trained to attack if a stranger comes too close. If trained properly, they will give a warning before attacking. A different type of guard dog is a livestock guard dog. Certain breeds of dogs are natural guardians of livestock.[5] Their job is to stay with and guard a flock or herd against predators.[5]
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