Time and again in the New Testament we see Jesus sharing parables and stories related to shepherds and sheep. It’s very very common. From psalm 23, talking about the rod and staff of the shepherd, to Jesus calling himself “the gate for the sheep” it’s throughout the scriptures.
“Dr. Andrew Bonar told me how, in the Highlands of Scotland, a sheep would often wander off into the rocks and get into places that they couldn't get out of. The grass on these mountains is very sweet and the sheep like it, and they will jump down ten or twelve feet, and then they can't