A guard dog is a dog employed to guard against, and watch for, unwanted or unexpected people or animals. Both guard dogs and watch dogs bark to alert their owners of an intruder's presence and scare away the intruder. The watch dog's function ends here; a guard dog is capable of attacking or restraining 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 or K9 Pro Sports training. Occasionally, guard dogs are trained to attack human intruders, though this practice might be locally illegal. Some breeds are excellent watchdogs but not excellent guard dogs because they bark loudly to alert their masters of intruders but are not given to attack behavior. Similarly, even very small but attentive dogs (among a few other species) may function well as watchdogs.

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