When I noticed Blitzkrieg's new Rottweiler avatar I got to wondering which dogs we members used for security and companionship (or which dog we would favor if we currently had no dog), and briefly, why. My current buddy is a Bull Mastif and shes a great dog, but shes getting pretty old and next time it's a Doberman Pinscher my all time favorite. So how about it? Do you like great big dogs, medium dogs, or small dogs who's main armament is a yap that can annoy an intruder too death? And why?