The Crosscheck Harness is the best harness to control your dog's pulling desire by requesting attention via their girth. It functions similarly to a martingale collar but instead requests attention around the dog's girth rather than its neck. This alternative limited-slip system allows the handler to request attention as the dog begins to pull, teaching the dog to walk beside them in an effective and humane way while doubling as a solution for escape artists. (US Patent App. No.17/603,903). The side attachment feature is most effective when the dog is on the left side of the handler (although it is possible to switch this over for right hand walks). For Best Results pair with a short non-shock absorbing leash such as the Vario 4 Leash. Features dual stainless steel D rings, an escape proof figure-8 design, and a silicone neck liner. See the girth measurement to select the best size. XS 12 – 16” SM 15 – 20” MD 19 – 25” LG 22 – 29” XL 26 – 38”.