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 in Okla.
CARLY ........ Ch. Lauremi's No Reservations (AKC GCh pointed, HIC)
RUSSELL .... Lauremi's Paix
and absent friends... SAGE ~ 2010-2015