Service Dog Vest - BONUS eBook on Clicker Training Included - Lightweight - 2 Free Removable Patches - PLEASE MEASURE TWICE BEFORE BUYING NOTE: PLEASE MEASURE TWICE BEFORE BUYING. Fits best on small and medium sized dogs. Measure your dog's girth according to the diagram in the photos to determine best size. Comfortable, durable, breathable mesh siding and nylon top material of service dog vest. 2 FREE service dog patches included. They attach via high quality velcro. Adjustable chest and girth straps for custom fit; side release buckle for easy removal D-ring for leash attachment. Machine washable.