It's breaking my heart, but the sibling rivalry between our year-and-a-half old Pembroke Corgi and six-year-old Australian Shepherd mutt have gotten to the insurmountable stage. We've gone through lots of training, behavior modification -- both the dog's and ours -- and other steps to try to resolve the issues, but instead of getting better they are getting worse.

Meanwhile Lucy is well trained, loveable, smart, and great dog. We just can't have the two dogs in the same room…