Buck found it to be cheaper to mend his ways than to retaliate. - Jack London

Oh! — and I speak out of later knowledge — Heaven forefend me from the most of the average run of male humans who are not good fellows, the ones cold of heart and cold of head who don't smoke, drink, or swear, or do much of anything else that is brase, and resentful, and stinging, because in their feeble fibres there has never been the stir and prod of life to well over its boundaries and be devilish and daring. One doesn't meet these in saloons, nor rallying to lost causes, nor flaming on the adventure-paths, nor loving as God's own mad lovers. They are too busy keeping their feet dry, conserving their heart-beats, and making unlovely life-successes of their spirit-mediocrity.

He had learned well the law of club and fang, and he never forewent an advantage or drew back from a foe he had started on the way to Death. He had lessoned from Spitz, and from the chief fighting dogs of the police and mail, and knew there was no middle course. He must master or be mastered; while to show mercy was a weakness. mercy did not exist in the primordial life. It was misunderstood for fear, and such misunderstandings made for death. Kill or be killed, eat or be eaten, was the law; and this mandate, down out of the depths of Time, he obeyed.

But nobody else ever romped with White Fang. He did not permit it. He stood on his dignity, and when they attempted it, his warning snarl and bristling mane were anything but playful. That he allowed the master these liberties was no reason that he should be a common dog, loving here and loving there, everybody's property for a romp and good time. He loved with single heart and refused to cheapen himself or his love.