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. A velcro strap goes around the waist, and the neck, to secure the vest in place. It allows for some size variation. Size XXS, heather grey color. According to the size chart in photos, for dogs under 8 lbs, like teacup chihuahuas, etc. Never used - I bought the wrong size! tags: thunder vest, thunder jacket, thunder coat, thunder shirt