"talking" to dogs works great if they are hunting under your feet.
Has nothing to do with hunting under your feet. My pups may bay cows a mile away but they ain't gonna catch or chew on none of them or run them thru fences putting too much heat on em. They just find bay and stay, when I get near enough to see that they've messed up I just call them out. Pretty simple really.
After they've been told no a few times they learn what's a hog hunt and what's a cow hunt.