My yorkie girls have never done this to me yet (crossing fingers). From the time I've had them I've practiced taking food right out of their mouth to prevent this from happening later on. I hope it works. Maybe you could start trying this. I think the trick is to show NO fear. They have to know your boss. I also have a pekingese and he pulled this crap when he was a pup. I wish I would have done this with him. He's a hardheaded little guy and it hurt my feelings so bad when he would do this. I try to remind myself that its their nature and you just have to try and teach them its not nice. Good Luck to you