Paul Owens Chew-Proof Training Tether for Dogs & Puppies 4 Ft. Chew-Proof Training Tether for Dogs & Puppies A professional dog trainer favorite. Tethers get your dog out of his crate and with you while still under control as he learns how to behave! A dog tether is a training tool for safety and management in the home. When tethering is used with positive reinforcement, it can be very effective in the success of your dog training program. Virtually Indestructible: constructed using plastic coated 3/16 in. heavy duty steel cable, and nickel plated swivel bolt snaps to prevent tangling. Free Shipping in the U.S. (Added at Checkout) Satisfaction Guaranteed - Paul Owens Approved