Sheep are dumb. They have no defensive or survival skills. You’ve never seen wild sheep because left untended or lost, sheep don’t go feral, they go to sheep heaven.
It’s never been a compliment to be called a sheep.
And so, when Jesus claims in John 10 to be The Good Shepherd, he’s making some specific and profound statements about not only himself, but about those he calls sheep. They're neither warm nor fuzzy.