The Dog Anxiety Vest That Is Already Used by MILLIONS of Dogs 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. 80% 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. Used but in great condition just too small for dog. 26 to 40 pounds