Rufus howls when I leave to work. My boyfriend leaves home later than me and he hears him howl
He doesn't only howl when someone leaves but also early in the morning... Wednesday I stayed home and @ 7 in the morning I heard him howl but everyone was still at home. We were in the bedroom and he was in the living room, he howled for a couple of minutes and then went back to do his own thing
We have never heard Nena howl, it's Rufus his thing