The English Cocker Spaniel is a breed of gun dog. It is noteworthy for producing one of the most varied numbers of pups in a litter among all dog breeds. The English Cocker Spaniel is an active, good-natured, sporting dog standing well up at the withers and compactly built. The English Cocker Spaniel is a breed of gun dog. It is noteworthy for producing one of the most varied numbers of pups in a litter among all dog breeds. The English Cocker Spaniel is an active, good-natured, sporting dog standing well up at the withers and compactly built. There are 'field' or 'working' cockers and 'show' cockers. It is one of several varieties of spaniel and is the foundation of its American cousin, the American Cocker Spaniel. In the late 19th century with the increase in popularity of dog shows and the creation of standards for various breeds, the Spaniel family began to split into various different breeds. A group of enthusiasts decided to create a large black spaniel breed.