I hate those things!!! I'm starting to bike with my dog , not because I love biking but he just wasn't getting tired from a walk and I'm not much for running *lol. So he's jogging by my side and his leash is tied to my waste so my hands are free, he's secure and the line is too short for him to run around the bike. I also use a gentle leader so that he can't pull me around even if if wanted to, since he's a bigger dog after all *lol. Anyways I'm going along the Trans Canada trail by my house and a lady with her two little scotties, which are on flexi leads are approaching me. My dog and I are doing what were supposed too, sharing the trail and going on our merry little way when doesn't her two f$#@$n dogs run out and she can't stop them even when she tries, so I ALMOST ran over one!!! I had to slam on my bike breaks and not 2 feet too soon! Jeeze people!!! I'm still fuming from it and now I don't trust her with her dogs and we both use the trail all the time.... grumble, grumble.