[elle1]

At 12 weeks they are young enough to begin training. I said young because the younger the better. I suggest you buy a training book or get a trainer. I was always told not to play with your hands or they do not distinguish between toys and you. I did not listen but did not have your problem. Your yorkie is also teething. I can tell you the behavior that is exhibited at this age usually does not remain for life. My yorkies tore things, shredded paper, ruined a shoe or two, etc. This behavior does not happen now. Through training and maturing they outgrew the destruction phase. But if your yorkie is biting you often begin by saying your yorkies name and NO. When she stops biting use the reward system. I use the reward system for everything but when they do something wrong and hear my voice that is enough to send 3 yorkies hiding for cover. You need to establish rules in your household and one should be you do not bite the hand that feeds you. Good luck and be strong.