On another forum, or maybe it was this one, some guy was riding with his dog on a leash and the two of them got tangled up and he ran over his dog. But God is good. His dog is fine, but in his fall the end of the handlebar went through his chest. He is a C5 quadriplegic for the rest of his life. He can breathe without machines but that's it. DON"T run your dog alongside your bike! It is not a best practice. It's stressful for them and not a whole lot of fun as it appears to be. And you could end up in an accident. That would suck rocks, I think. FWIW.