Comment to Which drive?
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i agree with you hugo as well as with what wolf and mike said, i cannot see anything icluding a typical aspect of prey drive, this would even be undisired with multiple atackers. the dog should have you and only you in focuse, so if the attacker sees he has no chance there is no need for chasing him, as this would not be desired if there were more attackers. the dog has to focus his owner and nobody else.