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Guard dog

A guard dog or watch dog is a dog employed to guard against, or watch for, unwanted or unexpected animals or people.

Both guard dogs and watch dogs bark to alert their owners of an intruder's presence. The barking is also an attempt at scaring away the intruder. The watch dogs's function ends here, while a guard dog might be trained to restrain or attack the intruder. For example, livestock guardian dogs are often large enough and strong enough to attack and drive away predators such as wolves. In cases where intruders are more likely to be human, guard dogs are sometimes trained simply to restrain an intruder with his owner's guidance, as in Schutzhund training. Occasionally, guard dogs are trained to attack human intruder(s), though this practice is generally illegal.