LOS ANGELES (AP) — BarbaraOgburn was waiting for guests to arrive for a dinner party when her Siamese cat Toby went to use his litter box."The guest bathroom smelled horrible and there was litter everywhere,"Ogburn said. "I looked at him and said, ‘Dude, your litter box is gone.’"Someone had given Ogburn a Litter Kwitter, a three-step trainingkit that teaches cats to use a toilet instead of a litter box. She decided to try it, and it worked. Now Ogburn, who’s had cats since she was a child, says she will never again have a litter box. No more buying litter, lugging it home, or cleaning it up.Litter Kwitter and other toilet-training kits on the market for cats work like this: The toilet seat is fitted with a series of plasticrings the cat can step on so it doesn’t fall in. The hole in the rings gets larger over time, until the cat can simply balance on the toilet seat.But training a cat to use the toilet is not as easy as getting a cat to use a litter box. Cats instinctivelybury their waste to hide it from predators, and litter fosters that instinct in a way that using the toilet does not, accordingto Steve Duno of Seattle, a veteran pet behaviorist and trainerwho has written 18 books.That’s why, when switching to the toilet, some cats will scrape the bowl, the tank or the wall next to the toilet. Outdoor cats are not good candidates for toilet-training.In addition, some cats tolerate change in their routines, while for others, even a slight change in feeding schedules will make their worlds fall apart, said Dr. Meghan E. Herron, chief veterinarian at the Behavioral Medicine Clinic, part of the Department of VeterinaryClinical Services at Ohio State University."Cats are slaves to routine and very wary of danger to themselves,"Duno added.And there is nothing about the size or height of a toilet that is normal to a cat, Herron said. "One bad experience with a toiletcan make them never use it again," she said.Duno, who has toilet-trained several cats, says he’s "known cats that have fallen into the toiletand that’s it, you’re done right there."You also need patience. "Cats learn at a very metered pace," Duno said. If you go too fast, your cat might find other places — furniture,plants, rugs or closets — to go, Herron said.When you talk about toilet-trained cats, most people think of Mr. Jinx, Robert De Niro’s beloved, toilet-flushing, mayhem-making cat in "Meet the Parents," "Meet the Fockers" and "Little Fockers."Dawn M. Barkan trained all the Himalayan cats that portrayedMr. Jinx in those movies, including two rescued cats, Peanutand Charlie, who still live with her.Misha, who has since died, did the original scene, but "we didn’t really train him to use the toilet," said Barkan, who freelances for Los Angeles-based Birds & AnimalUnlimited. "It’s movie magic."The cat sat on a prop designed to look like a toilet and pressed a button so that the toilet appeared to be flushed. Sound effects were added later.The idea for Litter Kwitter came from "Meet the Parents," said Jo Lapidge, who with her husband Terry invented the kit.After research and tests, the Sydney, Australia, couple launched their company in 2005. Since then, they’ve sold 750,000 kits.