Used but with a lot of life left, a little bit of previous dogs hair still on it Release 2009 Heather Grey Size Extra Small, 8-14Lbs range The Dog Anxiety Vest That Is Already Used by MILLIONS of Dogs ThunderShirt® is the original, vet recommended, natural calming solution that may 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 all types of anxiety, fear, and over-excitement issues in dogs. 89% of ThunderShirt® users see improvement in their dog’s anxiety when using the shirt*. The ThunderShirt® is recommended for thunder, fireworks, separation anxiety, travel, & vet visits. Treat anxiety, fear, and over-excitement in style! You’ll love the ThunderShirt®’s calming effect on your dog. 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. Please visit ThunderShirt® website 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. On instructions for how to put on a ThunderShirt®, please see the videos on this page. Please note that the Polo styles go on differently than the Classic and Sport, so make sure to check out the right video!