Is it possible to enroll Bella in an obedience class and have Dallys be the primary trainer? We had a young girl in one of our classes who came with her mom but the youngster did most of the work. She didn't have a boxer but had a mixed breed that was rather fiesty. It's a great way to bond and learn at the same time. Bella would learn that Dallys is the boss and nice things happen when she behaves with her.
Bella 6/13/06 CGC, TDI
Jake-border collie/beagle 6/20/99 & Reggie-Jack Russell 12/25/97