This really helps my foster who suffers from panic attacks.
Amazon.com: Vet's Best Comfort Calm - 30 Tab: Pet... . I think it's good to use this in addition to behavioral training. Remember, you aren't to act any different than you normally do and trying to reassure him can actually make the problem worse. The comfort calm shirt can work because a dog’s hair will stand on end during thunderstorms and this can be very uncomfortable. Some people have reported success with just rubbing a fabric softener sheet over the body, while other reported success with a snug type shirt.