It bugs me, I find them everywhere but I can't find one strong enough for walking the two boys! The one's I've seen are either thin chain, nylon with plastic, or leather with thin strips that could get chewed through/snapped quickly. So I've resorted to putting a neckline on them and then still putting two leashes on but holding both with one hand. They can't seperate further than what the neckline allows, and if something fails (whether the neckline or one of the leashes) I still got both dogs attached to me somehow.