I bought a 3 way coupler with leash on ebay. The lady was super nice to work with . I basically told her about my dogs and she made one to their needs. I have a Jack Russell along with my two yorkies so I needed one stronger coupler and she did that but made them all blend together and they look great as well as working like a charm. Her name is Tammy and her ebay name is tjs1962 -- here is a sample listing:
3 DOG COUPLER LEASH 3/8"X 5' NYLON SWIVEL SNAP EACH END - eBay (item 130397765478 end time Jan-29-11 20:48:22 PST) She will make them ny color or width you want and her prices are VERY reasonable. The workmanship was great too!