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.
Borzoi The Borzoi ( , literally "fast"), also called the Russian wolfhound (Russian: Ру́сская псовая борзая ), is a breed of domestic dog ("Canis lupus familiaris"). Descended from dogs brought to Russia from central Asian countries, it is similar in shape to a greyhound, and is also a member of the sighthound family.