This game is used to teach our dogs what boundary we want them to stay within. We do this by using a long line that delineates the perimeter of that boundary and then randomly marking our dogs (yes, good, etc.) anywhere within that perimeter. When you say your marker word your dog should turn to look at you at which point you toss a treat behind you in the opposite direction so that your dog has to run past you to get it. They then will turn and run past you again or you have the opportunity to cue them to a different behaviour to prevent them running back out. Have fun and be sure to mark and reward often!