Sounds as if he's had some sort of close encounter while outside with something that really scared him....chased by a kid, dog, cat, an owl or bird of prey, coyote or fox, or moutain lion? Do you live in an area where any of these things could occur? Don't force him to go outside, especially to do his toilet. Better for all cats anyway to be indoor cats. Do set up a litter box for him to use, and give him lots of love and reassurance. Hopefully he will come around when he knows he doesn't have to go outside.
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