As promised, I called that Buddy of mine. He said the only way he knows of without shooting them or hurting them is to put up an electric fence.
However a Bear will barrel right through a simple electric fence, like it's not even there, so you would have to hang some Tasty Bacon on the fence. This would cause them to touch the fence with a Paw, or better yet with his tongue. That should give him the hint.
Heck, better be careful, around here you go out to check pit a pit protected like that and you'll have neighbors hanging on the electric fence for tastee bacon!