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I've been considering getting a kit to train my cat to use the toilet. Reviews are mixed, but I think that some kitties are smarter than others, and the ones who don't understand are the ones who don't do well with pooping in the toilet.
One of the funniest stories I have EVER read was from Sindy Rodenmayer, owner of FatCat Quilts. It's about how she potty-trained her cats. Years ago she had it on her web page under a tab called "Family Dirt", which was nothing but hilarious stories about her family's shenanigans and adventures. Over time, though, her website got remodeled and that section disappeared. About 5 years ago, I asked her to repost it on FB and she did. If you want to read it, go to the FB page "FatCat Friends" and search for "potty training cat". It will make you laugh until you cry.