I've thought it over for quite a while, and i know now that i don't need a guard dog. I just want a dog that will scare any strange people or things by the bark and size alone. But i want a watch dog that is VERY alert and will bark at pretty much anything different or weird. I've been looking at Labradors now, but they seem too friendly for me. So, I've now come down to the Bernese Mountain Dog. But my questions are, how good of a watch dog are they? And is there size good enough to scare intruders? I know they are alert and tend to bark at strangers, but HOW alert are they, and are quick to sound the alarm with new things?? Because this is something I really want. I don't have any personal experience, so do any of you guys know? I really need to know.