The sibling rivalry literature is VERY helpful, and appears to have been written specifically for our situation. It's dead-on! I can see where our past human behavior and reaction has definitely influenced the dogs. I finally understand the dynamics of our pack. We are making significant progress following Monday's training, and are pleased with the results. The girls were exhausted on Monday and Tuesday but still very receptive to corrections, and continue to learn quickly. Many thanks to Dennis -- Bark Busters is really a great program.