I just asked Mr88GT this same question last night. If it's clear there's an intruder, it's one approach. Otherwise, one of us is probably going to investigate. But we have a dog too. There's some insurance in having him since we can take our cues off of him. He's pretty good about making people pee their pants when he alerts us to their presence. I watched one guy step off the front porch and back up 20ft the other day when his knock was met with the barking. And I never even opened the door.