With its patented design, ThunderShirt’s gentle, constant pressure has a dramatic calming effect for most dogs and cats if they are anxious, fearful or overexcited. How does ThunderShirt work?. Experts believe that pressure has a calming effect on the nervous system, possibly by releasing a calming hormone like endorphins.
Gable is terrified of storms and the shirt definitely calms him down. I would say it takes at least 50% of the terror from him. We have a storm rumbling as I type this review and he seems quite content. Normally he would be trying to climb up into my nostrils with terror.