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. An Escape Proof Dog Harness Using a simple figure eight configuration, this secure harness is incredibly easy to fit and hard for escape-prone dogs to wiggle out of. The front section of the harness goes over the dog's head much like a Quick-Fit Harness, with the girth strap completing the fitment with a simple side release buckle connection. Here's why the Crosscheck makes a great no- escape harness: Adjustable: The more points of adjustment a harness has, the more snug fit —and escape-proof—it will be. Always measure your dog to find the right size to start with. Our adjustable straps help you get the perfect fit or a large dog or small dog. Durable material: If your dog pulls, chews or tugs to get out of the harness, you'll need a harness with strong material. Extra strap: The belly strap helps keep your dog secure in the harness. Martingale attachments: The side martingale style attachment system gives extra control over dogs that pull. crosscheck harness check feature The Perfect Training Harness For Escape Artist Dogs The Crosscheck Harness has been successfully tested on different sizes and breeds for no pull training. This particular harness is perfect for puppies and young dogs that are in training. Teaching a dog at a young age not only not to pull, but to walk on the side makes for pleasant walking for years to come. The unique Crosscheck Harness feature can also be used to remedy the bad habits of a fully-grown dog that pulls. With two leash attachment points, the handler has the option of using the harness as a dog training harness or walking harness. Caution: Do not leave on dog unattended. Caution: PLEASE do not ever leave a dog tied up. Doing so with any EzyDog harness or collar will void the warranty. Thanks for caring about the safety of your dog!