Pottok the Losino, the Galician, the Landais, and the Monchino horses. Tests have revealed considerable genetic differences between populations in the Northern Basque Country and the Southern Basque Country, leading some to consider them separate breeds. Some claim the Pottok's origins derive from the horses on ancient cave paintings in the area and thus claim to descend from the Magdalenian horses of 14,000–7000 BC. Other link its origins to an influx of horses during the Bronze Age. However, neither of these theories has to date been scientifically verified. Genetic research by the University of the Basque Country's Genetics, Physical Anthropology and
Vulnerable dog breeds of the United Kingdom Trust. The breeds on the list have been promoted at events such as Discover Dogs and Crufts, and by asking that owners of these breeds mate their dogs rather than having them spayed. The majority of the list come from the Terrier Group, a group mostly derived from breeds with backgrounds in the British Isles. The most marked drop in popularity is that of the Sealyham Terrier, which registered 1,084 breeds in 1938, but by 2004 was registering only sixty dogs a year. In October 2011, British magazine "Country Life" highlighted the breed on its front cover, with the heading