Mastiff Relax Dog AromatherapyIs Your Mastiff Afraid of Thunderstorms? Fireworks? Being Alone? The Mastiff may give the appearance of being supremely confident and completely fearless, but even this giant breed can suffer from stress, insecurities or anxiety. Just as we have fear triggers, such as spiders, snakes, public speaking, flying or standing on the edge of a very high cliff, so can our dogs. Thunderstorms, fireworks, travel, trips to the vet or being left alone can cause