I got carpeted pet stairs for Gavin to use to reach me bed. Thing is, he refuses. I've tried all sorts of treating schemes, but he will happily use an ottoman as a stepping stool. I would hope the 3 steps instead of only 1 would be beneficial, but Gavin has an aversion to his rear paws on the steps. They seems sturdy, and the carpet means they are non slip/ Should I just give up?