Thundercoat overview ThunderCoat offers all the calming benefits of ThunderShirt now with added warmth and protection from rain.Water Resistant, Fully Lined, Removable Hood, Machine Washable. Thundershirt overview ThunderShirt's patented design applies a gentle, constant pressure that has a dramatic calming effect for over 80% of dogs. Most effective anxiety solution as voted by veterinariansAlready helping hundreds of thousands of dogs and cats across the countryGreat for storms, separation, travel and many other anxietiesNo need for training or medication