Good stuff TxMav. About the reverse drag thing for training purposes, wouldn't you want the scent to be "fresher"(if that is indeed what a dog is going by when they determine direction of a track) at the end of the trail(where the pig would be) rather than the beginning. Setting up the drag your way would leave more volume of scent at the pig end, but it would be technically older than the scent at the beginning. I'm pretty sure my dog would run that track the way you drug it, backwards... I think

Sounds like a good test to do after a few bud lights

I do see how that would probably work on a young dog to "jumpstart" them though.
On the intelligence of dogs, I believe that with massive amounts of time spent with a dog, one can raise just about any dog to genius level. Any dog I've ever had that I really like gets "inside time" and goes with me everywhere, I feel it really grows their thinking capabilities which makes them better at everything. Cross training for the brain shall we say.