THUNDERSHIRT Anti-Anxiety Jacket Size S Fits dogs and cats 15-25 pounds Like new / tried on dog but never worn for an extended period 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. 89% of ThunderShirt® users see improvement in their dog’s anxiety when using the shirt*. 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.