In 1795, Mr.Fuller of Rosehill park, Hastings in East Sussex, England began breeding dogs for a special purpose-Gun dogs to work in districts where the terrain was rough and the undergrowth very dense- which meant that a spaniel was needed which could give tongue or to alert the hunter on his quarry. This was a trait not desirable in any other spaniel. So Mr. Fuller decided to cross various dogs like the now extinct liver and white norfolk, the Field Spaniel and possibly some early springing spaniel. The Sussex Spaniel was one of the first breeds admitted into the stud book by the American Kennel Club in 1884. As the name implies, the breed originated in Sussex, England in the 18th century where it was used as a hunting dog. Because of its short legs and narrow body the breed could easily maneuver through the undergrowth, which made it the ideal hunting companion. The breed lost what little popularity it had in the 1940's. In 1947, only 10 sussex spaniels were registered in the English Kennel Club. Today this breed is more common in the United States than even in its originating country- England.

The Sussex Spaniel is a breed of dog developed in England. It played a part in the foundations of the Field Spaniel and is very similar in appearance to the Clumber Spaniel. It is used as a Gundog, and in Dog Shows.