A stretch leash dog is a type of dog leash designed with an elastic, flexible section that absorbs sudden pulls or jerks, providing a more comfortable experience for both the dog and the handler. The stretchy material helps reduce strain on the dog's neck and the owner's arm by gradually extending and retracting, allowing for more freedom of movement while maintaining control. Stretch leashes are especially useful for energetic dogs or those that tend to pull during walks, offering a smoother, more enjoyable outing for both pet and owner.