try a Walky Dog. We got ours at Amazon for $40 and it's amazing. Our border collie/greyhound mix adores it and now sits at the garage door and stares at us, waiting for us to take him for a bike ride. And, since he's attached to the bike, if I don't pedal I just roll along as fast as he wants to go. Or, I can push it a little and force him to get some good exercise in. Personally, I feel safer with that than with him on a standard leash next to me.