My gelding Walka will NOT share even a blade of grass with any other animal besides my mare. So, when the occasional deer wander into the pasture and Walka is out there they are quickly chased out. That also goes for the wayward turkeys that dare enter the pasture.
My husband calls Walka his pointer. Anything out there and he immediately locks both ears on it and then , if it's in the field , MOVES it FAST!