Pigs Are Affectionate

[Old Dummy]

I had my own sow on the farm as a young man, and it had a number of litters too. It loved being scratched behind its ears, though I agree, you should be careful before approaching animals that don't know you, (even then there can be injuries, as a cousin of mine was bitten badly on the leg as a young woman, by a nasty pig or boar, her father owned).
My sow had quite a nice life, as I found some rough ground, covered in brambles etc., and put a good fence around its shelter from rain or sun, and she turned over nearly all the ground seeking worms. My Godfather kept pigs all his life in his garden too, as a way of getting away from stress in a high powered engineering job, and to get away from the missus, (much as he loved her!). .

I raised pigs "in an earlier life."

They tasted great!

 

[Old Dummy]

Hogs are filthy critters. Hog farms must have mud wallows-pigs/hogs cannot tolerate direct sunlight for a lengthy period.
Mud coats their skin making a good sun blocker.
Mud and hog poo-not a pleasant smell.

Hogs kept in small pens become dangerous, will attack humans, if they get into the pen. (Perhaps it's the confined space
that makes them ornery.)
My memories of hogs is not cute little piggies, but 400 pound dangerous animals.

I have to take issue with one of your points: Anything kept in a too-small space will be filthy. Including humans.

Given a decent pasture hogs will stay very clean except for mud, which they need as you described.

My late dad told me this story, although he heard it from someone else, and I have no idea if this really happened: During WWII, when soldiers were looking for a place to bed down and there were hog farms in the area, they would kick the hogs out and sleep in their pens -- which were very clean.

Hogs will do their business away from where they sleep if they have enough space. I noticed this when I was raising them.