I just purchased my second Mountain Dog leash for my other dog. Until getting my first Mountain Dog leash a couple of months ago, my 2 100lb. Great Pyrenees rescues had eaten 6 leashes since I got them in August. They tried a couple of times to eat their MD, with no luck. Plus the design keeps them from snatching me off my feet when they decide unexpectedly to change directions on our daily walks. I hope I don’t have to ask for a replacement, but it is good to know if they do manage to chew through their leash, it will be replaced free. Thanks Mountain Dog, great product!