As a 20 year veteran of dog walking I can honestly say Mountain Dog (great name btw) has made the best leash on the market. Our current yellow labradoodle Dudley has chewed thru 3 different nylon leads and has a been know to run unexpectedly. So far he hasn’t been able to chew it and I love the strength of the Mountain Dog leash. I will recommend to all dog owners. Have you ever thought of developing a collar??? Keep up the good work and thanks for creating a great product!