Not the same situation -- not at all, but when we brought home our second GH, our first hound's personality changed in ways we really didn't like. We're working through it, sort of the way you're starting to, with lots of time when it's just him and one of us, special treats, new toys, and extra (short) training sessions. We also try to give him time and space when she's not around; in my hubby's office in the mornings, in the bedroom with me at night (I crash early), and in the living room with us both (other dog gets crated). It's working well, and he's getting over the crankiness/upsetness/confusion he was going through six months ago. It's not perfect, but he's happy more often than not now. It's pretty amazing what some ice cream or a burger does for his mood, too! Good luck to you and Rajah.