28. Nepalese Mastiff
The Tibetan Mastiff is a giant dog whose double coat changes color with the seasons. Weighing between 99 and 165 pounds, this attentive dog serves as a passionate family guardian. The American Kennel Club refers to them as the “Guardian Dog Supreme” for their calm demeanor 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 deter threats.