I have very similar problems with my female GSD mix and she is 4.5 years old now. I have still not been able to figure out a way to keep her from running up to people or after animals on off leash walks, but I have found something that works relatively well for guests coming to the house. When someone comes in the door, as soon as she starts jumping, I have them turn around and face their back to her. She will automatically stop jumping. Once she calms down for a few seconds, I then have the person turn around and greet her. If she starts to get over excited again, have them turn their back again. I continue to do this until she can stay calm. It usually only takes 1-2 tries. The only problem I run into with this is when she jumps up on a guest and I try and have them do the excersize, but they say "Oh, it's ok, I don't mind" and let her continue to jump on them and give her attention. Even after I tell them, they sometimes don't understand that I can't allow this because it regresses her training and progress.