The Tweed Water Spaniel or Tweed Spaniel, is a breed of dog extinct since the 19th century. It is most well known for being involved in the early development of the modern Curly Coated Retriever and breeds of dog. They were described as a generally brown athletic dog from the area around Berwick-upon-Tweed near the River Tweed and close to the Scottish Borders. A type of water dog, the breed was not well known outside the local area. This breed may have been created by crossing local water dogs with imported St. John's water dog, another breed of dog which is also now extinct.