Hundog Gotham Slip-N-Lock LeashThe new SlipnLock model is very practical because it is a collar and a leash in one single product. Now our leashes have one extra lock, that guarantees a safer and more comfortable walk with your dog. The first lock adjusts the neck size and the second one makes sure the collar stays in place during the walk. Made of resistant polyester, it is very easy to adjust. One size and indicated for medium and large size dogs.