"白先生"是一只母鹅，一只很老的大白鹅。爷爷对它特别尊敬，把它当成亲人，亲切地叫它"先生"。"黑勇士"是一条中华田园犬，浑身黑毛，体形健壮，但性子温顺。爷爷老是叫它"黑小子"，我却觉得它是"黑勇士"。 爷爷也不是一般人，他身怀武艺，不仅制服了受惊的牛，还使前来挑衅的两个大汉不战而退。"白先生"、"黑勇士"和爷爷之间又会有怎样的故事呢？
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