Baby used to be like that too. but noone wants a 100lb puppy jumping on them when ever they come over to visit. so whenever she goes to jump up, I'll stick my knee out so that it bumps her chest. She hates the feeling. then I say "NO Jumping" in a stern voice, and then look away and ignore her for like 2 min. Then I tell her to "sit pretty" and when she does it I give her ALOT of praise and a treat. that was she knows that Jumping on ppl is bad and sitting pretty is good.