I've been working for a while to train my cat to use the human toilet, and the process is taking much longer than I'd hoped. There is already a general question on the topic, but I have a specific problem with the process.
My cat took fine to going in the toilet (which currently has a dish in it to hold litter). It only took him a few days to get into the habit. In particular he has no trouble peeing in the toilet--even when I take away the bowl he doesn't have a problem peeing right into the water.
But poop is another matter--he really seems determined to poop only if there's litter there. I've tried to slowly reduce the amount of litter in the bowl until there's none. And even when we reach "none" he'll go once or twice without litter before deciding it's not worth it anymore, and opts to go on the floor next to the toilet (while still peeing in the right place).
I don't really understand the behavior--after all, the floor doesn't have litter either so I don't really know why he cares. He's never had this issue when using the normal litterbox either. Any ideas?