Way to go Rocky!!! Did he bark at it? My GSP, Rusty (RIP), even as goofy a clown and un-trained as he was, would always bark at snakes. I don't think he'd ever even been bitten by so much as a rat snake, but he didn't like snakes for some reason.
"I have no idea what WW-III will be fought with, but WW-IV will be fought with sticks and stones."