When Jet's been naughty, he has a time out in a corner of the room. Where he stays till I tell him to come to me for an explanation(yes I go through the whole, do you understand why routine) and a cuddle to show everythings ok now. A few mins ago he tried to get at my plate with a sausage on that I'd foolishly left on the low table. As soon as I saw him do it, I gave him 'the look' and he took himself off to the naughty corner and lay down without me saying a word. That proves to me that dogs really do know when they've done something wrong.