20 of the World's Rarest Dog Breeds Catahoula Leopard Dog. Chinook. . Norwegian Lundehund. . Otterhound. . Finnish Spitz. . Bedlington Terrier. . Swedish Vallhund. . Tibetan Mastiff. The Tibetan Mastiff is huge in size and noble in bearing, known for a “solemn but kind expression” and an impressive double coat. .
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