Maggie, my bluetick coonhound is the same way...if she thinks she's loose, she takes off. I think that's how she ended up at the shelter we adopted her from. I have had some success with putting her on a long line (I have a 100' clothesline that I put a snap on for her). She can get pretty far away, but when she gets close to the neighbor's yard, I can stop her. She is starting to respond to her name when I call her and she's farther away. It also helps to have some really good, stinky treats to give her when she gets back (I made a batch of the salmon treats that someone posted on the health page a month or so ago, and she loves them). She used to get loose and run and run and run...chasing her just meant that we were following closely enough to make her feel secure enough to go further