We don’t say we have a guard dog, we say we have an alarm dog, cause if something is skulking about, their onto it, and letting everyone know about it as well. I had a friend, and with his dog barking at passerbys, he’d say thank you, and dog would look proud about it, and bark no more. With our guy in that situation, we tell him to stop, and he’ll always bark once more, while looking right at whomever told him that’s enough (like he’ll stop, but only on his terms)