I might be wrong but to the best of my knowledge pigs cannot be housetrained. I’m surprised the support pig didn’t leave a trail of swine s**t down the aisle.
I have no personal experience with pigs of any size or breed. So I googled and this one came up:
A potbellied pig can be housebroken faster than most dogs. If you teach your pig good habits from day one, your pig will not have “accidents” in the house. You can start a piglet with a litter-box if you’d like, but then quickly teach your pig to do his business outdoors in a designated spot.
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But I’d probably try to confirm that before investing in one. One of my dogs is a Bichon, which is notoriously awful to housebreak and he wears a diaper. No idea if diapers come in pig size gigantic.