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 ~ AKC Ch. Lauremi's No Reservations (AKC GCh pointed, HIC)
RUSSELL ~ Lauremi's Paix
and absent friends... SAGE ~ Lauremi's Whim Z v Jakmar (AKC Ch. pointed-13 pts, HIC) 2010-2015