I think this is kind of a preference thing. If you’re just walking her for a nice little stroll, then it’s probably not a problem. I don’t let our dog linger because then we’re stopping all the time, and since he isn’t neutered, that means we have to stop long enough for him to pee on it, too! If we want to let Kaos explore and sniff we let him loose in a baseball field. We’ll close the gates and let him go. He sniffs at EVERY brick, pole, leaf and base, then pees on most. When we’re walking, though, we keep his attention on us.