HAVMMD13 Size-See Chart Below: Medium Features: -Dog harness. -Color: Red and Black. -Available in XXS, XS, Small and Medium sizes. -Adjustable with an ergonomic fit to allow for maximum mobility. -Design to doggles popular V mesh harness. -High end duraflex brand hardware for extra durability. -Includes reflective trim all around for added safety. Specifications: -XXS dimensions: 7" H x 5" W x 1" D. -XS dimensions: 10.5" H x 7" W x 2" D. -Small dimensions: 14" H x 11" W x 2.5" D. -Medium dimensions: 17.5" H x 12" W x 2.5" D. Reflective Mesh Sizing Chart Medium: -Chest Length: 22 - 26 inches / 55 - 66 cm. -Girth: 22 - 28 inches / 55 - 71 cm. Measure Dog to Find the Perfect Fit