Great safety net for off leash training – purposely made to be chewed through I have always had 3 or 4 big dogs at a time. They weigh between 80 to 120 lbs, and I cannot put them all on leashes at the same time. I live in Maine, with at least 100 acres of woods behind my house, and we walk the trails 6 to 8 times a day. I always use an e-collar on these walks, but if one (or two) of them have bolted on me recently, I keep these leashes on them for a week or so until I feel they are under control again. (We call it the punishment leash). Tie a half dozen or so knots a couple of feet apart near the handle end, so if they do bolt all you need to do is step on it to stop them. Without the knots, it will just pull right through. Do NOT pick up the leash to try to stop them, it will peel the skin right off your hands (or ankles).As a safety feature, these leashes are specifically made lightweight and easy to chew through. They are used for dogs that you don’t yet trust, so chances are no matter how careful you are they can still bolt faster than you can catch them. Dragging a long leash through the woods means it will eventually get caught, and you can just follow the drag marks or the barking to find them. However, twice I’ve had a dog go missing for hours (once during a blizzard) only to finally turn up dragging 6 feet of leash. They had chewed through it and disaster was averted. Another time my GSD took off after geese in a pond and his leash got stuck on something under the water, but he freed himself in seconds.A couple of years ago, my sweet black Golden Lab (yes that is a thing) took off with 60 feet of leash trailing, and I spent 10 hours in the cold rain looking for her. Unfortunately, she doesn’t bark, ever. I figured she was stuck somewhere, but I couldn’t find her. When it got dark out and I was giving up, two policemen from my town came out and helped me search for another two hours. We finally found her tangled in the bushes on a neighbors summer property. She is such a gentle dog that she has never chewed through anything, including her leashes. Another of my dogs chewed through it with one snap a couple of weeks later.So, these leashes are NOT tie out leashes, they are made to break in emergencies, just like cats collars. And that is a very, very good thing, not a defect. They should only be used when you are with them supervising them.Tie out cables should be used when you want them to stay put (although you should still keep an eye on them) and never as a trailing training leash as they (usually) cannot be chewed through and the whiplash from the clasp end could seriously injure you or your dog.