One of my favorite Bible characters is Ezekiel. He had some interesting things to say on the subject. First of all, it applied to Israelite shepherds, but perhaps the modern day shepherds should take note.
15 I myself shall feed my sheep, and I myself shall make them lie down, is the utterance of the Sovereign Lord Jehovah.
16 The lost one I shall search for, and the dispersed one I shall bring back, and the broken one I shall bandage and the ailing one I shall strengthen, but the fat one and the strong one I shall annihilate. I shall feed that one with judgment. (Eze 34:15-16 NWT)
20 Therefore this is what the Sovereign Lord Jehovah has said to them, Here I am, I myself, and I shall certainly judge between a plump sheep and a lean sheep,
21 for the reason that with flank and with shoulder YOU kept pushing and with YOUR horns YOU kept shoving all the sickened ones until YOU had scattered them to the outside.
22 And I will save my sheep, and they will no longer become something for plunder; and I will judge between a sheep and a sheep. 23 And I will raise up over them one shepherd, and he must feed them, even my servant David. He himself will feed them, and he himself will become their shepherd. (Eze 34:20-23 NWT)