Thundershirt is a terrific solution for fear of thunder, fireworks, separation anxiety, travel, jumping, barking and more. Thundershirt s gentle, constant pressure has a dramatic calming effect for most dogs when anxious, fearful or over-excited. Recommended by thousands of vets and trainers around the world. Thundershirt is a positive-training device that is drug-free, completely safe, comfortable, effective and offers a money-back guarantee.