I found the best leash for my two girls. Here is the link. (Scroll down to Deluxe Double Dog Walker)
http://www.bebopusa.com/dept/leashes.html
I chose the most narrow width leashes. The grip is amazing. My two girls walked along happily without getting tangled up with each other. This company also makes a chest harness nearly identical to the Easy Walk, with the D-ring on the chest. They have one small enough to fit Holly, which Easy Walk did not. Just thought I would pass along a great find. And the company is great, super fast shipping.