Between St. John's water dog and the Polish Hunting Dog which was known to be a landrace bred for a specific purpose?
St. John's water dog The St. John's water dog, also known as the St. John’s dog or the lesser Newfoundland, was a landrace (a dog bred for a purpose, not pedigree or appearance) of domestic dog from Newfoundland. Little is known of the types that went into its genetic makeup, although it was probably a random-bred mix of old English, Irish and Portuguese working dogs. The number of St. John's water dogs started declining by the start of the 20th century. By the early 1980s, the variety was extinct.
Seskar Seal Dog The Seskar Seal Dog ("Seiskarinhyljekoira") is an extinct dog breed from Finland that was recently recreated. The modern dogs are not direct descendants of the original breed. Moreover, they are not used for the same purpose as the original breed. The original breed is typically called Seskar Seal Dog and the modern version Seskar (or Seiskari) Dog. Some 200 individuals in Finland represent the modern breed.