I've had Gracie for over six years without any difficulties, but lately she's decided that she doesn't want to use the litter box consistently anymore. Now she pees right outside of the litter box and on a few occasions she's pooped out in the living room. I tried getting a new litter box, an open one instead of the old one I had with a top on it. At first, I thought maybe things were improving but she's gone right back to peeing on the floor. I don't know how to train them--I thought they just sort of knew what to do instinctively--but I'm getting near my wit's end with this. I would welcome any suggestions you might have.