Millions of Dogs Helped ThunderShirt is the original, natural calming solution that helps reduce anxiety in dogs in a drug-free way. Like swaddling an infant, ThunderShirt’s patented design applies gentle, constant pressure to calm all types of anxiety, fear, and overexcitement issues in dogs. Proven to be over 80% effective in reducing anxiety for fireworks, thunderstorms, separation anxiety, travel, vet visits, problem barking and more. Treat anxiety, fear, and over-excitement in style! You’ll love the ThunderShirt’s calming effect on your pup. Over 80% effective Veterinarian recommended No training required Money-back guarantee Our ThunderShirts have frequently been referred to as Thunder Jackets or Thunder Vests – if that is what you are looking for, you are in the right place! From Chihuahuas to Great Danes, millions of dogs have already benefited from the calming effects of a ThunderShirt. Yours could be next – we can’t wait for you to be part of the ThunderShirt family! Please see our ThunderShirt for Dogs Instruction Sheet for additional information on how to use the Heather Gray, or Sport Styles. If you purchased one of our Polo styles, please see this instruction sheet.