ThunderShirt Classic Dog Anxiety Jacket Drug-free solution for pets struggling with thunder, fireworks, separation anxiety, travel, and vet visits. Applies gentle, constant pressure to dog's torso, to calm most dogs by creating a sensation similar to swaddling. Made from breathable fabric in solid gray heather. Adjustable fasteners. Brand: ThunderShirt Color: Solid Gray Size: Large (41-64 lbs) Material: Cotton/Spandex Blend Pattern: Solid Closure: Hook and Loop Special Features: Patented Pressure Design, ThunderPatch Recommended Use: Anxiety Relief, Training Care: Machine Washable Origin: Made in Vietnam Condition: New, never used. Box has been opened. Keywords: calming vest, dog swaddle, pet stress relief, thunder jacket, fireworks aid, travel anxiety, vet visit, canine compression, behavior training, drug free, large dog gear, heather gray, pet wrap, adaptil compatible Item shipped from smoke free home within two business days.