Bungee Leash Coupler
This is an inexpensive way to walk multiple dogs on your existing leash. This is the Bungee Leash Coupler.
This leash works as an addition to almost any existing dog leash that you have, and allows you to add a second dog. The coupler is made of an elastic material that streches to avoid any shock or injury to the dog, and keeps the excess leash from getting between your dogs legs and tangled up.
If you need to walk two dogs at once and would like a quick and easy way to convert your leash for use with two dogs, this attachment will do the trick.