am the same as you clachan,have to muck around with cubs as i will lose alot of estates but some dogs i have founs are good at doing them and had a couple that arent,even when there are still vixens still living in and out with them.every dog is different,one of my mates bitchs is a cracking digging dog but wont entertain any thing to do with cubs but he has just accepted this and the bitch still has its kennel space.