Maybe I'm just not seeing it right, but, how do these things keep the dog from running too close to the bike? i can see how they are able to keep the dog from other people or whatever or running too far or tipping the bike, etc. But, it still seems like they'd be able to get too close to the bike or just out in front of it. I'm definitely going to have to have someone help me with Finn, because it'll be the first time he's done anything like that. Maybe leash him, too, and, run beside him while he's attatched to the bike and running beside me. I don't know, I hope to start soon...