It depends what you want my sheppard was nuts no man could get through my gate including my mates but he suffered from seperation anxianty and barked at any person walking down the fence line if its a warning any dog that barks would do you need to take into account the new laws there bringing in. The sheppard I had was very protective of the other half and the kids. Or are you wanting a dog to look the part as a deterent if so any large dog would do also there were a spate of dogs being poisiond round my end too get access to a property as they tried with mine but it never took food off anyon