I have a dog terrified of storms. We have used other products in the past which worked well, but only if we were able to administer it at least 30 minutes before anything started. As we all know sometimes storms come quickly and it would be too late to give it to her. This product works amazing for her! Even if I wake up in the middle of a storm and she is shaking and whining I can still give her this and it works very quickly! We actually have a storm right now and I realized we are getting low, so I'm here to place a other order! Meanwhile she is laying curled on the couch relaxed.