Thundershirt Stress Relief for Dogs in Gray Size Medium (26-40 lbs) ThunderShirt is the original, vet recommended, natural calming solution that may reduce anxiety in dogs in a drug-free way. Like swaddling an infant, our dog anxiety vest's patented design applies gentle, constant pressure to calm all types of anxiety, fear, and over-excitement issues in dogs. The ThunderShirt is recommended for thunder, fireworks, separation anxiety, travel, & vet visits. Treat anxiety, fear, and over-excitement in style! You'll love the ThunderShirt's calming effect on your dog. • Comfortable and soft • 60% polyester, 35% rayon, 5% spandex • Very good preowned condition, box included