Question: What do both Norwegian Lundehund and Kerry Blue Terrier have in coman

full_context: Document 1: Norwegian Elkhound: The Norwegian Elkhound is one of the ancient Northern Spitz-type breed of dog and is the National Dog of Norway. The Elkhound has served as a hunter, guardian, herder, and defender. It is known for its courage in tracking and hunting moose (or elk) and other large game, such as bears or wolves. The Norwegian Elkhound was first presented at a dog exhibition in Norway in 1877. It is one of the oldest dog breeds, and Elkhounds have been found buried in Viking burial grounds. They make excellent family pets.
Document 2: Bedlington Terrier: The Bedlington Terrier is a breed of small dog named after the mining town of Bedlington, Northumberland in North East England. Originally bred to hunt vermin in mines, the Bedlington Terrier has since been used in dog racing, numerous dog sports, as well as in conformation shows and as a companion dog. It is closely related to the Dandie Dinmont Terrier, Whippet and Otterhound.
Document 3: Pomeranian (dog): The Pomeranian (often known as a Pom or Pom Pom) is a breed of dog of the Spitz type that is named for the Pomerania region in Germany and Poland in Central Europe. Classed as a toy dog breed because of its small size, the Pomeranian is descended from the larger Spitz type dogs, specifically the German Spitz. It has been determined by the Fédération Cynologique Internationale to be part of the German Spitz breed; and in many countries, they are known as the Zwergspitz ("Dwarf-Spitz").
Document 4: Russell Terrier: The Russell Terrier is a predominantly white working terrier with an instinct to hunt prey underground. The breed was derived from the Reverend John Russell's working terrier strains that were used in the 19th century for fox hunting. The Reverend's fox working strains were much smaller than the Show Fox Terrier and remained working terriers. The size of the Russell Terrier (10″ to 12″) combined with a small flexible, spannable chest makes it an ideal size to work efficiently underground. Their unique rectangular body shape with the body being of slightly longer length than the leg makes them distinctly different from the Parson Russell Terrier and the JRTCA Jack Russell Terrier.
Document 5: Norwegian Lundehund: The Norwegian Lundehund ("Norsk Lundehund") is a small dog breed of the Spitz type that originates from Norway. Its name is a compound noun composed of the elements "Lunde", meaning puffin (Norwegian "lunde" "puffin" or "lundefugl" "puffin bird"), and "hund", meaning dog. The breed was originally developed for the hunting of puffins and their eggs.
Document 6: Skye Terrier: The Skye Terrier is a breed of dog that is a long, low, hardy terrier and "one of the most endangered native dog breeds in the United Kingdom" according to The Kennel Club.
Document 7: Cairn Terrier: The Cairn Terrier is one of the oldest terrier breeds, originating in the Scottish Highlands and recognized as one of Scotland's earliest working dogs. The breed was given the name Cairn, because the breed's function was to hunt and chase quarry between the cairns in the Scottish highlands.
Document 8: Norwegian Buhund: The Norwegian Buhund is a breed of dog of the spitz type. It is closely related to the Icelandic Sheepdog and the Jämthund. The Buhund is used as an all purpose farm and herding dog, as well as watch dog and a nanny dog.
Document 9: Finnish Spitz: A Finnish Spitz (Finnish language: "Suomenpystykorva") is a breed of dog originating in Finland. The breed was originally bred to hunt all types of game from squirrels and other rodents to bears. It is a "bark pointer", indicating the position of game by barking, and drawing the game animal's attention to itself, allowing an easier approach for the hunter. Its original game hunting purpose was to point to game that fled into trees, such as grouse, and capercaillies, but it also serves well for hunting elk. Some individuals have even been known to go after a bear. In its native country, the breed is still mostly used as a hunting dog. The breed is friendly and in general loves children, so it is suitable for domestic life. The Finnish Spitz has been the national dog of Finland since 1979.
Document 10: Kerry Blue Terrier: The Kerry Blue Terrier (also known as the Irish Blue Terrier) () is a breed of dog. Originally bred to control "vermin" including rats, rabbits, badgers, foxes, otters and hares, over time the Kerry became a general working dog used for a variety of jobs including herding cattle and sheep, and as a guard dog. Today the Kerry has spread around the world as a companion and working dog. Despite a Kerry Blue winning Crufts (the most important UK dog show) in 2000, it remains an "unfashionable" breed, and is distinctly uncommon; however, it not as threatened as some of the other terrier breeds such as Skye Terrier, Sealyham Terrier, and Dandie Dinmont Terrier.
Document 11: Rat Terrier: The Rat Terrier is an American dog breed with a background as a farm dog and hunting companion. Traditionally more of a type than a breed, they share much ancestry with the small hunting dogs known as feists. Common throughout family farms in the 1920s and 1930s, they are now recognized by the United and American Kennel Clubs and are considered a rare breed. Today's Rat Terrier is an intelligent and active small dog that is kept both for pest control and as a family pet.
Document 12: Swedish Lapphund: The Swedish Lapphund is a breed of dog of the Spitz type from Sweden, one of three "Lapphund" breeds developed from a type of dog used by the Sami people for herding and guarding their reindeer.
Document 13: Black Norwegian Elkhound: The Black Norwegian Elkhound (Norsk Elghund Svart) is a modern variant of the Grey Norwegian Elkhound. It is a small Spitz breed and is very rare outside the Nordic countries of Scandinavia. It is bred for the same purpose as the Grey Norwegian Elkhound but is smaller, more agile, and easier to recognize in the snow. Historically, it is a much "younger" breed, first bred in Norway during the early 19th century. It is classified by the FCI as a hunting dog, although it is also used as a watchdog, guarddog and herder.
Document 14: Icelandic Sheepdog: The Icelandic Sheepdog is a breed of dog of spitz type originating from the dogs brought to Iceland by the Vikings. It is of similar type to the Norwegian Buhund, the Shetland Sheepdog, and the Welsh Corgi. They are commonly used to herd sheep in the Icelandic countryside.
Document 15: Border Terrier: The Border Terrier is a small, rough-coated breed of dog in the terrier group. Bred as a fox and vermin hunter, the Border Terrier shares ancestry with the Dandie Dinmont Terrier and the Bedlington Terrier.
ground_truth: dog breed