The ThunderShirt Sport effectively treats anxiety, fear, and over-excitement in style. Designed for comfort, the breathable jacket features washable, durable fabric with contrasting trim and reflective logos for safer nighttime walks. ThunderShirt has the best patented pressure wrap design available. Great for thunderstorms, fireworks, separation anxiety, travel, vet visits, problem barking, reactivity, and other stressful situations XXL- Great Dane, Mastiff, Irish Wolfhound 110lbs Chest Circumference 37"-50"