This was in the article posted in Dog Health about summer safety. I thought it would fit here as well.

Summer storms
Many pets become stressed during summer storms due to the change in air pressure and the sounds of thunder. Calmatives such as Content-Eze (www.Sergeants.com) or Rescue Remedy may help. You should also prepare in advance by teaching your pet to rest calmly in a crate (www.Petmate.com). If pets are regularly fed their meals and offered special treats and toys when in the crate, it will become a reassuring resting spot during potentially stressful times.