ThunderShirt Sport Platinum for Dogs Stop problem barking, chewing, and anxiety in your dog the natural way. ThunderShirt Sport's patented design applies a gentle, constant pressure that has a dramatic calming effect. Designed for comfort, the breathable jacket features washable durable fabric, with contrasting trim and reflective logos for safer nighttime walks. Using pressure to relieve anxiety in animals has been a common practice for years and is Veterinarian recommended. Features: Variety of sizes to fit most dogs Over 80% effective Veterinarian recommended Great for fireworks, storms, separation anxiety, travel and more No training required Completely drug free Item Specifications: Color: Gray Sizes: XSmall: Dogs 8-14lbs, Chest circumference 13-17" Small: Dogs 15-25lbs, Chest circumference 17-21" Medium: Dogs 26-40lbs, Chest circumference 21-25" Large: Dogs 41-64lbs, Chest circumference 25-30" XLarge: Dogs 65-110lbs, Chest circumference 30-37" XXLarge: Dogs 110lbs, Chest circumference 37-50"