I have a 95 pound german shephard that is very very well trained. Tho, do to my own fault I have a problem with her. I have played this game with her where i put a stick of gum or some thing in my teeth and she jumps up and grabs it out by the way never touches my mouth! now the problem is she is as big as me now and i can't break her of this habit because she does it so fast that I dont know shes going to be doing it. Well, the other day I was sitting in a kitchen chair and she sprung up quickly and knocked the chair right over with me in it..so this has got to stop now. I do realise the best way is not to teach them things like this but, too late so anyone with any suggestions on how to "untrain" her so to speak? The bad thing is she just all of a sudden does it now because she thinks its fun so I dont know when its going to happen.. well any suggestions would be appreciated..thanks Sam
By the way she doesnt do this with anyone but me.

I'm not really sure this will help or not but is there any way you can teach her to only do it when you give her a command. At least this way you could be prepared for it. Maybe you could tell her to sit and then think of a command for her to actually take the food from your mouth. This is the only idea and I hope it helps. If not, I'm sure someone else will come up with some idea to help you. Good luck.

Thanks Vshelton for you input here. I will look into this..