I would say most Dobes are Protective to a Degree. It really depends on how their raised. Dont be expecting a whole lot when their young as they get older they get more protective. Every dog is different Holly is 13 months now she runs to the Door and Barks/Growls like crazy when she hears/Sees something. When their young the best thing you can do is take them everywhere you build up their Confidence which is always good. If you bought a Pup that came from a Working pedigree and you didnt work and bring their Drives out properly later on would they be more Dangerous? or would they just not reach their potential?