I have two ferrets that used to be 100% accident free, in and out of the pen. I adopted one of them (he's 2 yrs old) 2-3 weeks ago. Why would they start going on the floor (right next to the litter box) when they have always used the litter box??? If I'm not right there to put them in the box, they go on the floor. Any suggestions? [Posted in FML issue 2370]