In one of your last posts, you answered a members question about her drives, i.e. Food, ball etc. your reply was basically that she has food drive and ball drive but haven't played fetch much due to focusing on obedience and that your other dog doesn't allow it i.e. possessive of the ball?
Based on this, what are her outlets for fun and activity? Tug is a great outlet for the need to mouth, grab, shake and receive active interactive attention with their owner with something that is acceptable to mouth and bite. Same with ball play. I think if you know what drives her, you can utilize those drives to teach her what is allowed to do and what is absolutely unacceptable. Example, you have the ball, you show her you are ready to play, she gets amped and jumps, very firmly call "no, sit!" As soon as her butt hits that floor, toss the ball for her to chase or catch and praise the heck out of her. If she doesn't sit, help her/make her sit and then toss that ball and praise the heck out of her again. Get the ball, she even looks like she going to jump, stop her. Help her get in the sit. Before doing any fun obedience play with her, remove your older dog from the area, room or yard. This is yours and her alone time and should not be interrupted or disrupted no matter how much your older dog protests. If you feel bad about excluding you older one, then fit in some Alone playing time with him after.
Tug, or food, same deal. She wants it, she has to sit first, with your help if need be but she has to do it every single time. It is called NILF. (Nothing in life is free) and should be applied for anything she wants to do. It may sound harsh but if you do it in a positive manner, once they get it, something lights up in them. Life gets easier and more rewarding. It isn't confrontational if done right.
I'm a novice with only one GSD under my belt but he understands that doing what I command gets him what he wants and that one way or another he is going to comply first so that I can reward him.
don't turn your back on her as it leaves you unprotected even though she doesn't mean harm, her age and size can cause a knock down or other mishaps.
Take what I've offed that seems sound advice for you and or tweek the suggestions to fit what may best work for her until you are able to start with the trainer. I do know that Ivan has a couple of YouTube short clips of his training techniques and methods that are worth watching.
"If you can't see his soul when you look in his eyes, then you need a seeing-eye dog"
Last edited by Heartandsoul; 04-05-2019 at 10:35 PM.