Thanks - will make an appointment and get back to you afterwards.
Hi Fiona,
You'll need to first of all have him checked out by a vet, just to reassure that there is no underlying problem.
When you've done this and if all is fine, give me a call at Chats du Quercy to better discuss - 05 63 94 73 97.
There can be many reasons why this suddenly starts happening from a stray cat passing by the window outside to an aversion to the litter type or placement.
Best of luck!!