Sporn Halter Blue Extra Large The Sporn Pull-Control ensures a dog's comfort by avoiding pressure on the larynx and trachea while offering his walker better control and manageability than chokers and spike collars. It is made of the highest quality braided cord and nylon webbing with thermoplastic and nickel-plated steel fasteners. The Sporn Pull-Control patented design redirects the leash tension to the area behind your dog's front legs, a sensitive area where the slight pressure applied by the Pull-Control restraints will stop your dog from pulling without discomfort.