EXPAWLORER Anti Anxiety Stress Relief Service Dog Harness, Training Reflective Calming Adjustable Vest Harnesses Black Medium Size Medium is for dogs whose chest range are between 25 and 30 inches. The chest plate is adjustable.(All straps are adjustable). If your dog is close to the maximum measurement for one size, get the next size up. The elastic strap made of neoprene material on the belly part of the harness which is velcro closure can well release the pent-up stress,reduce the abrasion for dog's chest,and make dogs feel comfortable and calming. The front strap and the "SERVICE DOG" letters are reflective, designed for safety.The 2 Removable Reflective Velcro Patches, one for each side of Harness, can be picked off and put other patches you want instead. The handle on top for control and training.Stainless Steel D-Ring for Leashes and ID Tags. Relieve your dog's anxiety problems simply. This harness will soothe and calm even the most stressed out dogs