It is sad that Trooper has to go but I am certain he will be a happier in his new home.
My Rainbow Bridge Penny was very like that, destroying everything etc, I had to keep her locked in one room while I was out working, she used to howl as well, I don`t know if Trooper does that? Anyway, I should have been as unselfish as your roommate and yourself and found her a new home, Im sure she would have been happier.
But I didn`t and when I stopped work it was such a relief for her and I, although she never did stop the howling when I went out, even if I was only out for a short time. Poor girl. And poor neighbours too, a German Shepard howling is not a sound you want to be hearing!
It says a lot about my neighbours though, in that it was a long, long time, years even, before I even knew that she howled! I had stopped working and had been at home for some time when a new next door neighbour, whose partner worked nights, asked me, very politely and quietly, if I could do something about it.