I have a pig, and she will eat many things, but she will not go potty near her food. I move her pen around and one of the first things she does is look around to figure the best place for her potty, and it is always in a place that moves away from the pen, and usually the furthest from where I will approach the pen.
I know that pigs can be mean to each other if they are overcrowded and they will lie in their shit if they can't turn around or move because of crowding ( which is really wrong!) but they don't lik it.
the problem with my pig is she will step on her food. If it gets too dirty, she won't eat it, and so there is some waste. I heard elephants create alot of waste in a similar manner.
That comment about not eating pigs is great, but I think pigs should not be eaten because they are noble, smart, kind and loving, and you can always use them to get rid of the body.
PS it takes 351 p.s.i. to open a macadamia nut and my pig eats them like popcorn. she can eat anything, why would she eat shit? or snakes?