Newfoundland dogs are known for their giant size, intelligence, tremendous strength, calm dispositions, and loyalty. They excel at water rescue/lifesaving because of their muscular build, thick double coat, webbed feet, and swimming abilities. The Newfoundland dog is known for its calm and docile nature and its strength. They are highly loyal and make ideal working dogs. Newfoundlands are ideal companions in the world of therapy and are often referred to as the nanny dog. 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.'