I talked to my trainer about this and this was his take on it, he broke it up based on the dogs I have and their personalities. Yukon: he had no problems working the bite and he had and has extremely high defense and prey drives. Him it was all about directing those drives in the right direction and due to his younger age at the time..not pushing but making it a game. Ebony: only has medium drives...have worked up the prey drive some, and let the defense drive go as she just is not interested in fighting anyone or anything. So she is an excellent candidate for SARs