I have the Bike Tow Leash and really like it. I haven't tried it out on big boy Russell yet, but it's worked great for the girls. They can't pull me over (Carly tried).
~ Diane ~
RUSSELL .... Lauremi's Paix
CARLY ........ Ch. Lauremi's No Reservations (AKC GCh pointed, HIC)
and absent friends... SAGE ~ 2010-2015