Viking Icelandic Sheepdog- has probably not changed much since the Viking Age. The Icelandic Sheepdog almost disappeared in the but was rediscovered by Englishman Mark Watson who started systematic breeding.
Icelandic Sheepdog Origin Story: The Icelandic Sheepdog's first job was to work sheep, cattle and horses with the Vikings in AD. They are one of the oldest dog breeds in the world. Fun fact: It is the only dog native to Iceland.