More permanent sheepfolds. Such shelters are usually built by the shepherd in a valley, or else on the sunny side of a hill where there is protection from cold winds. This fold is a low building with arches in front of it, and a wall forming an outdoor enclosure, joining the building. When the weather is mild, the sheep and goats are allowed to be in the enclosure during the night, but if the weather is stormy, or the evenings are cold, then the flock is shut up in the interior part of the fold, with its protection of roof and walls. The walls of the enclosure are about three feet wide at the bottom, and become narrower at the top. They are from four to six feet high. Large stones are used in constructing the outsides of the wall, and they are also placed on the top, and then the center is filled with smaller pieces of stone, of which there is much in the land. Sharp, thorn bushes are put on the top of this wall to protect the sheep from wild animals or robbers. There is a gate guarded by a watchman.
JESUS made reference to the familiar sheepfold of Israel when He spoke those memorable words of His: "He that entereth not by the door into the sheepfold, but climbeth up some other way, the same is a thief and a robber. But he that entereth in by the door is the shepherd of the sheep. To him the porter [watchman] openeth. (John 10:1-3).
[Manners And Customs of Bible Lands]
Read More about Permanent Sheepfolds