When were Newfoundlands bred?

In the early 1880s fishermen and explorers from Ireland and England traveled to the Grand Banks of Newfoundland, where they described two main types of working dog. One was heavily built, large with a longish coat, and the other medium-sized in build - an active, smooth-coated water dog. The heavier breed was known as the Greater Newfoundland, or Newfoundland. The smaller breed was known as the Lesser Newfoundland, or St. John's Dog - the founding breed of the modern Labrador Retriever. Both breeds were used as working dogs to pull fish nets, with the Greater Newfoundland also being used to haul carts, and other equipment.