Thanks all - older cat is 11. He is more dominant than she is. I have tried just rinsing the trays, but it did not make a difference. I have tried Olbas oil, grapefruit oil, curry powder, but will try pepper. It is not just by the doors, it is wherever there is a rug. If I move the rugs, he will still pee on them. If there are no rugs around, he will look for the closest carpeted area and pee there.
With the Fullers Earth, is that mixed with the usual litter or instead of? I have not tried this, what is the advantage of it?
I have some Feliway, but could try a plug in by the front door near the box he uses for pees most often.
There is another cat next door who he will have a screaming match with every now at then - they will each sit by the fence in their own garden and vocalize at each other, but that seems to be as far as it goes. I think the cat does come into my garden at times, but my pets see him off if he does. However, the problem predates this house.
I really dont want to rehome him, I have never given up on a pet but the thought of 10 more years of this at least......
I will put a tray of sand in the garden too. I wish he would go out more, but he has never been very interested in doing so. The other cat actually comes on walks with me and the dogs, she is very adventurous. But he has always been a content to stay in.
He was the runt of the litter, and is not very bright - when the kitchen was redone a few years ago I made a special place for his food - it took him weeks to look there first, rather than the previous place. The other cat worked it out in 2 minutes.