I just took mine to places where there was rabbits and let her teach herself when she was stock broken. As for marking holes it is different with every dog, some will stare in to the hole others will dig. Mine would just stare in to the hole and she wouldn't leave till we had put the ferrets in or bolted a fox with the terriers. She retrieved a fox back once in front of the farmer who had caught us poaching but he was ok and I ended up with the permission. I'll try to scan some pics in of the old bitch, I would have another one if a decent one came up