An impressively large dog with noble bearing, the Tibetan Mastiff is an aloof and watchful guardian breed. They possess a solemn but kind expression, with an immense double coat it can be black, brown and blue/grey, with or without tan markings, and various shades of gold. Although seen in shows in the United States today, they may not enjoy participating in organized activities such as obedience or agility due to their highly independent natures.