It is sometimes referred to as a hog pen, hog parlor, pigpen, pig parlor, or pig-cote, although pig pen may refer to pens confining pigs that are kept as pets as well. Pigsties are generally fenced areas of bare dirt and/or mud. "Sty" and "pigsty" are used as derogatory descriptions of dirty, messy areas, the word sty deriving from the Proto-German stijan meaning filthy hovel.[1] There are three contributing reasons that pigs, generally clean animals, create such a living environment: