As much as I love thunderstorms, my poor pup Allan is terrified by them! His vet suggested I get him a snug baby onesie, yes a baby onesie, because they are cheaper than thunder shirts and work just as well. If you have a bigger dog, you can wrap a t-shirt or a scarf around them tightly. She also told me it is safe to give him Benadryl, which blew my mind but it does the trick! Be sure to do your research, or give your vet a call so you give them the correct dosage!