No collar or harness required. With adjustable loop, it is extremely easy to put on and take off. This sturdy premium slip ring dog leash is made of high-strength nylon rope, super durable metal ring and leather sleeve knot. Provides maximum durability and comfortable grip. The slip ring leash tightens when your dog pulls and loosens when the behavior is corrected. Excellent dog training leash to correct controlled behaviors. 6 feet perfect length for outdoor walking, jogging, hiking or training. Suitable for large, medium and small dogs and puppies.