The protection phase is the most misunderstood by the general public. The most important point to understand when watching a protection routine is the relationship between dog and handler. The dog must never bite the trial helper, unless either the dog or the handler is attacked. Then it must attack fully and without hesitation. But here the real difference becomes apparent. The dog must stop biting on the command of the handler and guard the trial helper without further aggression. Often people confuse Schutzhund protection training with police dog or personal protection work. The Schutzhund dog is capable of the feats of never being aggressive except under those specific situations it is trained to face, and even then it must always be under the absolute control of the handler.