We have a 1yr old Australian Cattle Dog named Jett and we were having a difficult time finding exercise that challenged him. A lot of the things we tried Our dog trainer suggested Bike Tow Leash and after reading the brochure and watching some videos, we decided to try it. I decided to hook it up to my Specialized Rockhopper. Jett took to it immediately and was running beside my bike right away. He tried to run over to another dog and I thought for sure his abrupt change in movement would affect my bike, but it did nothing to interrupt the movement of my bike. Both times he tried to run toward another dog, the Bike Tow Leash kept both Jett and I safe (I wasn't pulled over and the one time he ran toward my front tire, it prevented him from touching it). We've used it several times now and he's a pro at running alongside the bike and the look of joy on his face is just wonderful. He's so happy that I actually find myself laughing at the look of joy on his face as we ride through the neighborhood! This is the best thing ever for us and for Jett. My only regret is that we didn't buy it sooner!