Whew!  It's already getting better - Koori and Ripley were co-existing in my office yesterday!  Koori sleeps at my feet when I work, and Ripley slept wherever she wanted to - but often near me, without an issue with Koo.  Ripley did abandon me for Alex when he got up and went to work - he's working in the living room, and his floor is carpeted - vs. my office is in the kitchen and has linoleum.  (I have a couple of dog beds out there and she actually used them occasionally....but also slept on the floor, a rug, whatever.)