Not even kidding...jack links is what keeps Jericho's attention in our training classes. It's the only food I've found that will keep him in a solid heel position. He really struggles with his front paws, when we're heeling. He can't figure out how to eat and walk at the same time. But all the other treats didn't keep his attention so he'd just surge ahead.
Don't worry I won't fill him up on cheapo jerky, I just thought it was funny, and kind of trashy of him :-)
I also tried the meat stick/cheese stick combo...that wasn't tasty enough!