From what I heard once from a friend it is little dog syndrome. The little dogs think they are big and mighty and want to challenge everything they see. My friend’s Yorkie had that issue, he wanted to fight everything no mater what size his opponent was.
She looks like a sweet dog, I hope she finds a home. Any dog you own if you train them right and teach them right from wrong can be a valid asset to society. Heck animals behave better than children any day. Maybe Annie shouldn’t get to close to them.
My thoughts exactly