The Shepherd’s Lantern
Shepherds bred the border collie sheepdog, also known as the scottish collie, to feature a white tipped tail. Shepherds would work the flocks of sheep, starting before the early morning predawn hours and again in the evening as the sun set.
This purposefully bread trait, known as the “Shepherd’s Lantern”, would act as a beacon, or lantern, which the shepherds could follow in the darkness before the raising and after the setting sun.
While no longer required in the modern era, it is still found on most border collies and can be useful for finding or following the dog in the darkness.