Ive seen a few people around here ride with their dogs following behind with no leash. Im trying to get my dog used to it by taking her walking on the trails as often as i can. Not till i know she wont just run off at the sight of a bird in flight will she be off a leash. I think/hope the more she gets used to seeing the wildlife out there the less lighly she will sprint out after it.
btw my dog is a pure bred mut.