Professional trainer Tom Dokken works with hundreds of dogs every year and understands the value of quality training equipment. His leashes and check cords are used exclusively in his kennel and will work great with your dogs. The Puppy Check 30 ft. 2-in-1 Leash can be used in a variety of situations. Made from highly visible and highly durable braided nylon with metal hardware. The 30 ft. length is perfect for daily walks with your puppy, and for training.