https://en.wikipedia.org/wiki/Chesapeake_Bay_Retriever
The Chesapeake Bay Retriever is a large-sized breed of dog belonging to the retriever, gundog, and sporting breed groups. The breed was developed in the United States Chesapeake Bay area during the 19th century. Historically used by area market hunters to retrieve waterfowl, pull fishing nets, and rescue fishermen, it is today primarily a family pet and hunting companion.