As a last resort, sometimes medication can help severely afflicted dogs. Desensitization is a process where the phobia-producing noise is presented so subtly that it does not produce a fearful reaction. As your dog becomes accustomed to the sound, you can, very gradually, increase the intensity for volume. Over a period of time your dog will get used to the noise. Flooding is an extreme method that is not usually recommended.
Flooding can sometimes produce long-lasting phobias much worse than they began.
Yawning is a calming signal for dogs. Dogs will yawn when they are nervous in effort to calm themselves. When you yawn repeatedly in the presence of your dog you can produce the same effect for your dog. Look away from your dog and yawn when he is nervous or scared. Yawn repeatedly for 5 - 30 minutes.