What is the proposed derivation for the name "Collie" related to historical duties?

Answer

The Scottish black-faced sheep, the "Colleys"

The very term 'Collie' is theorized to originate from the specific sheep breed that these devoted companions were historically tasked with managing in the Scottish Highlands and northern England. These sheep were known as the "Colleys," referring to the Scottish black-faced variety. The historical function of these dogs was primarily centered on their exceptional work ethic, involving the herding and guarding of livestock, which suggests the naming convention is deeply rooted in their occupational duties rather than purely physical characteristics.

What is the proposed derivation for the name "Collie" related to historical duties?
animalDogExpectancyCollie