a simple whistle or "heh" sound will almost always stop them, I used this when I was bowhunting this year, I learned the hard way though. Last year I had a buck come out at about 60 yards during gun season, I shot and apparently missed, he went into the woods, then came out about 5 minutes later leisurely trotting across the field behind a doe, he was about 80 yds out and I didn't realize I could whistle at him... afterall, it was only my first year of hunting! This year, I had a doe walking by me at a steady pace with my bow in hand, and drawn back, she wasn't stopping... so I whistled and she stopped perfectly in the only opening I had for a shot. Unfortunately, I never found her after tracking for 2 hours, but I had a decent shot on her and if I had not have whistled, she would not have stopped.

Shane had to do this with his deer this year too, she was moving quickly across the field and he had a pretty hefty pinch of Skoal in his mouth and couldn't get a whistle out until it was almost too late... LOL