28. Nepalese Mastiff
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The Tibetan Mastiff is a giant dog whose double coat shifts color with the seasons. Weighing 99–165 pounds, this vigilant dog is a passionate family guardian. The American Kennel Club calls them the “Guardian Dog Supreme” for indoor calm and outdoor territorial nature. Once Himalayan watch dogs, they are independent and self-assured, using size and a deep bark to deter threats.
