i don't like working defence before prey, i feel that the dog should first of all develope his prey drive and work it to his age when he can show better his defence if he has any and from there slowly and nicly develope into his fight drive but each to his own when you do train guard dog it's no matter what kind of prey drive he has, we will look more into his defence because most of usuall guard are there to scare and show themselfs the other part of them, the serius protection dogs, wel i don't see how you can work a good full soiled bite when the dog alredy knows defence, but i can be wrong let me ask around for that