The Dog Anxiety Vest That Is Already Used by MILLIONS of Dogs ThunderShirt® is the original, vet recommended calming solution that helps 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 many types of anxiety and fear issues in dogs. 80% of ThunderShirt® users see improvement in their dog’s anxiety when using ThunderShirt®*. ThunderShirt® is recommended for thunder, fireworks, separation anxiety, travel, & vet visits. Treat anxiety and fear in style! You’ll love the calming effect of ThunderShirt® on your dog. --Already used by millions of dogs --Veterinarian recommended --No training required --60-Day Satisfaction Guarantee** --Easy to use - put on in 3 simple steps --What is the Difference Between the Different Types of ThunderShirt®? While we have several different styles and colors of ThunderShirt®, they all may have the same calming effect for your dog! Each style of ThunderShirt® is lightweight, machine-washable, and breathable, and they all help your dog to feel calmer during fireworks, thunderstorms, travel, vet visits, and more! They are all equally as effective, so you cannot go wrong with your choice! How Do I choose the Right Size ThunderShirt®? In general, if your dog is right on the cusp of the weight range indicated in our size chart, we would recommend that you size down. However if you are looking at one of our polo styles, those tend to run smaller, so we would recommend sizing up if you are interested in the polo style ThunderShirt®. Sizing can be tricky - do not hesitate to give us a call at (866) 892-2078 and we'd love to make sure you find the right size for your pet