My Dad used to have pigs. He always said that they were very clean animals and they never messed in their bedding. The Exuma pigs didn't either - they messed in the sea so I spent a lot of time avoiding the floating pig turds
They are clean.... our pig sty was very high and pointed...we used to pretend it was Croagh Patrick so we'd climb it to the top and pray....(didn't have toys)....and the pigs were very tolerant..... :-)