SmartLeash Solves The Problem With All Other Retractable Leashes: Your Dog Can Dart Before You Reach The Brake Button SmartLeash is the FIRST AND ONLY retractable dog leash that protects you and your pet. When your dog tries to unexpectedly run or bolt from you, SmartLeash quickly, safely and automatically locks the leash. SmartLeash then stays locked until your dog releases tension on the leash, providing both you and your dog a worry-free walk once again. Does your old retractable leash worry you? What if your dog runs after that squirrel, will your leash automatically brake? SmartLeash® is the FIRST and ONLY retractable leash that automatically stops your dog when he or she tries to suddenly run or lunge. SmartLeash operates like a regular retractable leash unless your dog tries to run — then Smartleash locks, quickly, safely and automatically. Like a seatbelt! Patented in the USA and around the world, join thousands of dog owners who trust SmartLeash.