Years ago an old man told me they are docked because if a young terrier gets in behind the other they have habbit of grabbing hold of anything that moves like a tail. That need not worry many of us now. Most dogs work on their own. But it always sounded like good sense to me. Shake a fox tail for any terrier pup they will be mad for it. Nip them off at four days old. No mess no fuss. Just thought I would share that. Happy hunting lads