Teddy barks like crazy but won't do anything. Dusty is just happy go lucky. Roxy is really smart about it. As long as the person enters the backyard though the sliding glass door (not the fence) or enters the backyard WITH me, she's sweet as can be. But, we did have the power company guy and the fencing guy cornered and held down by her recently. (Another smart thing, she won't bite.) They'd went back there without me being home. Everyone that knocks on my door is a guest, so she is nice to them.