Yes I have used a whip, however I tend not to use it much anymore as he is always concerntrating on that and when the whip moves a little he rushes away from it. I have tried 'desensitising' him and I got to the point where I could crack a stock whip off him, but he still rushes away from a dressage whip or crop. Also, the main reason for me using the spurs wasnt to make him more forward, it was to make him move off my leg and when he is rushing away from the whip he totally ignores my leg.