Hello. Hoping some of you lovely lot can help with a bit of advice. Moved house 5 weeks ago with our lovely 9 year old cat. At the old house, came and went as he pleased, toiletted outside. When we moved, we kept him in for 3 weeks, then put a cat flap in, started letting him out a little at a time to explore, he's doing well, and happy. But he's still using the litter tray. What's the best way to get him back to going outside to toilet? I don't want to just take it away if that's going to cause him issues.
Thank you!