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In page Newfoundland (dog):

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A Newfoundland's good, sweet nature is so important, it is listed in the Breed Standards of many countries; dogs exhibiting poor temperament or aggression are disqualified from showing and should never be used to breed. The breed standard in the United States reads that "Sweetness of temperament is the hallmark of the Newfoundland; this is the most important single characteristic of the breed."[5]