hello , i am absolutely  in agree with training the dog to beva proper guard dog . you should consider the fact thatvthese dogs learn their duty by watching older shepherd dogs ,  and in protecting a house they must be trained .  also i think their trainabity is reduced because of their focus on attack in a tunnel sight manner and calling them to stop may be very difficult thing to learn them .  these magnificant dogs belong to their natural work and are not suitable for guarding facilities , home etc.  their major drawback is difficulty of controllig them when they are nervous and agigated .