I've had enough with the girlfriend's dog climbing up on my sofa. I'll put cushions up to stop him doing it but he'll nudge them off and then lie like Lord Muck on there for the rest of the day. He knows he isn't allowed to do it and always jumps off when he me returning home and then gives the 'I'm innocent, me' face when I tell him off. He's currently chained up for his misdemeanours.

So any ideas on how to keep him off? I guess something that makes him not want to get up there in the first place - an electric shock, water pistol etc. would do the trick.