Review on 6 FT Durable Slip Lead Dog Leash With Zipper Pouch, Padded Handle And Highly Reflective Threads For Medium/Large Dogs (18~120 Lbs.), By IYoShop - Black by Ryan Gilliam

My dog does not try to chew it so I cannot attest to that, but it is pretty sturdy stuff. I assume a dog could gnaw through it, but only over time and much effort. It is thicker and stronger than I expected. The leather ring keeps the loop around the dog's neck from falling lose and slipping down. The metal retainer absolutely prevents over tightening. I keep mine snug at the top of the neck so she does not pull at all. If your dog is pulling against you, move the leash to the top of their neck away from their shoulders and they will not pull.