Ultimate Freedom: Ultra-Light Hands-Free Dog Leash with Adjustable Options. Enjoy total freedom during every walk, run, or hike with our ultra-light, hands-free dog leash — designed for an active lifestyle. Whether you're taking a lap with your dachshund or your doodle, this leash is perfect for any size dog. The difference between size S and size L is the size of the clips. We recommend S for dogs up to 5 kg and L for dogs from 5 kg to 18 kg.