According to historical narrative, which terrier breed consistently surfaces as the most startling contender for the title of rarest?

Answer

Skye Terrier

The Skye Terrier edges out many others for the honor of being the rarest when considering official acknowledgment and vivid descriptions of near-extinction.

According to historical narrative, which terrier breed consistently surfaces as the most startling contender for the title of rarest?
DograrestbreedTerrier