" The born watchdog patrols his beat once in so often during the night. At all times he must sleep with one ear and one eye alert. By day or by night he must discriminate between the visitor whose presence is permitted and the trespasser whose presence is not. He must know what class of undesirables to scare off with a growl and what class needs stronger measures. He must also know to the inch the boundaries of his own master’s land. "
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