Yes, we trained our kitty cat, Maggie to go in the toilet. And you can too with these inexpensive and subtle steps in weekly increments.
With animals, much like people, you have to use the technique called behavior shaping. Basically we made these subtle changes and Maggie wasn't really all that aware that things were different or changing. So patience and slow subtle steps is what will help you succeed in doing this. And if you do this with your feline, I'd like to know and possibly see some "tasteful" photos.
Day One: Move their litter box next to the toilet, like side by side if you have the room.
Day 3 or 4: Change out their box to something open and smaller, if your current one is similar to ours pictured.
Week Two: Attached a toilet seat to their open little box. This gives them the time to learn how to balance and understand where to make their potty. We picked the seat up for less than $10.00 at Home Depot.
Week Three: Attach the litter box with toilet seat to a box equal to the height of your toilet. We attached it to the box using clear packing tape. Alternatively, you can slowly build up the height over the course of the week by gradually adding magazines or something similar until the height finally matches the toilet height.
Week Four: Here is the most annoying step especially if you only have one bathroom: Attach plastic wrap over the toilet bowl under the seat. Leave it just a little slack to create a small depression. Add some of their used / dirty litter to the top so they can sniff out where they're supposed to go.
Week Five: Success! Remove the saran warp from toilet and just let your kitty figure out the rest. They may still have balancing issues.
But they'll eventually find their most comfortable potty position.
Maggie would have preferred I not take photos of her while using the big girl potty. But you know, I couldn't help it.
[Note: we eventually got her back using a regular litter box due to her tendency to reach down and splash around in the water when she was done. Apparently she couldn't resist her little kitty-cat urge to bury her mess! But it was a fun experiment. We got some minor flack from people who considered this less sanitary than a litter box, but if you think about it-- having a box full of kitty poo constantly making airborne dust and being tracked about is way less sanitary than this method]
Content by: Agent J