A person whose job is to take care of animals like sheep, goats, cattle, or reindeer, keeping them together and watching over them.
From Old English 'hirde' (shepherd), related to 'herd.' The agent noun 'herder' formed by adding '-er' to 'herd' has been used since medieval times, particularly in pastoral cultures.
Herding dogs were so important to human civilization that we literally bred entire dog breeds—like border collies and Australian shepherds—whose instinct is to herd. Some can control hundreds of sheep with just eye contact and movement, which is basically mind control.
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