Tibetan Mastiff Relax Dog AromatherapyIs Your Tibetan Mastiff Stressed by Thunderstorms? Or Anxious About Fireworks? Your Tibetan Mastiff is almost certainly a very imposing dog. Their size alone is intimidating, add in that Tibetan Mastiff aloofness, their calm confidence and their coat which adds a mantle of further intimidation and you have one heckuva bold warrior dog. But let a storm roll in and the thunder begins and your big dog is one trembling, terrified puppy. Your Tibetan