i dont recall the name of it, and i cant pull up the petsmart website, but they have them at most petstores
It is a little attachment you attach youre leash too and then attach two or three additional little "branch" leashes to the dogs harness
here this is a dog coupler from drfostersmith
http://www.drsfostersmith.com/produc...&N=2001+113845
and here is one for three dogs......
http://www.superleash.com/Super_Dog_Leash_Couplers.html