Thank you all.  The loss is still felt strongly, but the remaining 4 of us are adjusting.

Callie said  "Sooooo I became "Sissy" and funny thing was, it always was far far more a "sister" relationship than mom/dog. "  Our Sissy was named as she was to be Happy's sister, but she was totally Martha's shadow and sister.  She was bossy also, and we always called her Sissy-Bus because she would just expect to get her way.