Tried that with my Rottie, by the time i climbed the fence he jumped he had peeled a sheep of the back off the herd an had it by the the throat on the floor. It lived by the way, I got to it in time, but it was impressive an scary all at once , prey drive just kicked in just like that been mad on anything that moves since rabbits, cows, sheep,cats, pain in the ass, limits the places you can walk them he was fine before then, so wanna get it spot on this time.