Hi Yvonne, it sounds as if you already know all the "tricks", so you don't need advice. Your friend needs to see that frightening a dog into behaving is wrong. A lot of things "worked" for previous generations, but I think things have moved on since then. So many dog training and handling experts tell us that aggression begets aggression, and I really think it's true. Would you (not you personally!) teach a child to behave by slapping it across the face every time it did something unacceptable? To me, it's one and the same.