This rugged on-leash training harness is built with two attachment points: one on the back for day-to-day walks, and one on the chest for increased control that helps you work against pulling. It's built with comfy cushioning, Carhartt's durable duck fabric, and reflective stitching for safety in low-light situations. Fit Guide: Measure behind front legs and across broades part of the chest. If your measurement falls between sizes, opt for the next size up. Small - 17-22"Medium - 22-29"Large - 29-36"X-Large - 35-42" | Carhartt Training Harness in Brown | Size Medium