Oh...didn't anyone tell you? GSD girls own ALL the toys. That's the sacred Law of Dogs. It doesn't matter who's bigger. If they're older, and they're female, the toys belong to them. And probably the best dog bed too.
Seriously, this is incredibly normal. It leads to peaceful households. Relax and let them be. They've worked it out, and it's fine. Count your blessings that you aren't breaking up dog fights -- sometimes GSD girls are notorious grudge holders. The boys let it go (usually), but the bossypants girls...nah. I love having a "peacekeeper" in my multidog home -- they're lovely, get along, don't take things personally, and just roll with dog-on-dog dynamics. That's what everyone wants!!!
Trust me, if you ever live in a home with two dogs vying for dominance or pack position, you'll forever long for the days of your easy-going boy. Value what he's doing and trying to teach you about dog social behavior. He has a lesson for the human here.
If you want to build true confidence, enroll in an excellent obedience class with him. It doesn't teach dogs to fight (which you seem to think you want but don't really). It teaches him that he always knows the right thing to do, and nurtures your bond. That's the real source of inner strength, for most dogs.
Last edited by Magwart; 07-04-2018 at 06:10 PM.