I am a dog breeder/trainer in Montana and have used this type of leash for many years on training young and older dogs. And have found this is the best leash for large or small dogs. I recommend this lead to all of my clients who are starting out with a new dog or trying to train an older dog. This leash is Durable multi-filament 4 foot by 10mm polypropylene solid core hand stitched leather work, and nickel finish D ring. Unique leash and collar in one is designed for easy correction while walking, exercising or training. Slip Leads have an adjustable leather slide to prevent lead from slipping off. easy on your hands with its "Broken in Feel" right from the start.