Just a note - this is a VERY old thread.
Please don't not KNEE your dog in the chest to teach him to stop jumping up. You can do great harm to the dog and the person can get set off balance and fall.
Kneeing a dog requires that the dog is already jumping up on you and he has no chance of stoping himself. Its like punching someone for having bumped into you - not the best way to get your message across.
Try to be proactive not reactive. You know when they are thinking about jumping up so use your voice and body language in advance. Stop the thought before it becomes an action. Teach what will get your attention and reward that.
Love Them & Lead Them,
~Elizabeth & Doug
Dog Training the Way Nature Intended