I know that many game ranches consider warthogs "common property" and don't really mind if you shoot a couple extra. By the way, many cheetahs are persecuted on game ranches and I also had the chance to shoot on sight (northern province, thick bush...cheetah country?!??) but I don't think I would kill one given the chance.
I know that leopards often go from one property to another, and are also killed pretty much on sight.