38 Dog Breeds That Require Extra Caution and Understanding

28. Nepalese Mastiff

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The Tibetan Mastiff represents a giant dog whose double coat changes color with the season. Weighing 99–165 pounds, this attentive dog is a passionate family guardian. The American Kennel Club calls them the "Guardian Dog Supreme" for their calmness indoors and territorial nature outdoors. Once the watch dogs of the Himalayas, they are independent and self-assured, using their size and deep bark to ward off threats.