I shoot cats, too. Not as often as dogs, but still. And it's lots of fun, too. But if cats decide it's rather time for a nap, the session is over. It's far easier to photograph younger cats as they are still quite curious and often love to play.
I usually only use one flash with animals. This might need a bit of editing afterwards. In this case I brighten the background to become white. My white cardboard is more grey out of cam.