I went out one night with a lad and his collie/grey x bull/grey, lamp on and rabbits spotted so he slipped the dog, up the beam it stalked, stopped after 10 yards so he encouraged it on, it crept forward a bit more then stopped, obviously that rabbit wasn't the right flavour for him, lol. It did run some rabbits that night but others it wouldn't. Now, does that mean that every collie/grey x bull/grey pick their runs?