f**k off, I use this one when they've rolled in shit or just had a rat and try and jump all over you and lick your face when your not expecting it. Dick ed, when they do something stupid. You little *&^% (add your own 4 letter word here) when they do something naughty
My terrier at about 9 weeks would sit to the word a hand signal and a whistle. He's 10 now and I just talk to him like a mate really and he does what he wants unless its something I don't want him to.