How does ThunderShirt work? Like swaddling an infant 👶, ThunderShirt applies a gentle, constant pressure to your dog or cat’s torso. Research on both humans and animals suggests that this type of pressure can release a calming hormone like oxytocin or endorphins. There is a reason we love hugs! 💓 #thundershirt #dogxanxiety #petanxiety #catanxiety #baby #babies #hug #babyswaddle #swaddle #dogcare #dogcaretips #dogtips