I have seen Laceys, Australian shepherds, blue healers, Border collies and a lot of mixes used for tracking and some retrieving. Some can air scent well others are ground scent mostly. I think it is the real herding dogs were bred to be versatile and tractable. The Lacey was bred to be a tracker as well as a versatile ranch dog. Mostly I have seen these used for game recovery. For hog running it is a mix of hounds and then the pit bull crosses for holding dogs.
