Our girl (4) goes in and out as she pleases, via a cat flap. She has always used the litter tray for both wees and poos and in fact used to come back in to use it and then go straight back out again. However, for the past few weeks she hasn't used it once. She definitely isn't going in the house, so must have decided to go outside now.
I prefer it this way, but am curious as to why, after 4 years, things have changed! Any ideas??