I have a male (neutered) JRT that is about 6 years old. Other than some aggression issues with other male dogs, he's very well-behaved and was the star of his obedience class. However, if you let him out of his lot, he runs. Don't get me wrong, he can run all he wants. But, he gets his mind on something and runs and won't stop or listen and runs out to the road, and across the road, and to other people's property. I fear for his safety and think that if I could just get his attention, he would listen, it's just like he tunes me out. I've tried a long cord for him to drag so I can grab it and stop him, but that little sucker can fly!! I've thought about using a shock collar to get his attention and call him back. Has anyone had experience with this?