I agree that if you are out in the country it's a lot different than letting your dog of leash in a city. If you have a dog that will come when called then the dangers are greatly lowered as long as they are supervised. There are pretty much no cars due to the fact that everyone owns several acres of land. I won't mention names but I know a certain person here that always posts pictures of her dogs running loose and no one ever says anything. But if you notice in her pictures you never see any cars or anything that could pose a possible danger to her dogs. But it also depends on the dog, if the dog is going to run far out of the owners view then I wouldn't do it. But if it's a dog that will stay close by then I don't see the problem.