Is it for a pet?
If so, send me an email and I'll send you the care sheet I give out.
And there are plenty of pigs that don't hit a hundred lbs, BUT, you have to see the parents, and preferably also the grandparents, and have a breeder that knows that not every pig in the litter will be small.
Whether for a pet or livestock (I raise both kinds), males should be nuetered by the breeder before you get him. Females should NOT be spayed, regardless of what you hear on pet forums online, because pigs often react badly (read, they die or develop lifelong issues) to anesthetics. You should never have hormonal issues unless you let her get obese.
Speaking of obese, it won't matter for a feeder pig, but pets and breeders should be kept trim. A pig is actually a pretty athletic animal. How they look when they're weaned is the body shape they should have for life.
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These are two of my potbelly piglets - this is the same shape they should still have as adults. Rolls and a huge swaying belly are not normal - that's fat and it's just a bad for them as for you.
The solution is to feed them *all they want* of good green food, and take it easy on the starchy and fatty foods.
You can go to any livestock supply store and get "pig panels" and they're fantastic. You want at least 3 posts per panel. Provide shade - lots of shade - and a pig hut that is not too big, because a snug one filled with straw will keep them warm when it's cold. Rubber feed pans are also awesome.