The English Cocker Spaniel is a breed of gun dog. There are two varieties of English Cocker Spaniels, the "field" or "working" cocker and "show" cocker. It is one of several varieties of spaniel and somewhat resembles its American cousin, the American Cocker Spaniel, although it is closer to the working-dog form of the Field Spaniel and the Springer Spaniel. The show breed should not be confused with the working breed as the show breed lacks almost all of the original hunting qualities. The show cocker is not trainable for any serious field work. Outside the US, the breed is usually known simply as the Cocker Spaniel, as is the American Cocker Spaniel within the US. Due to the breed's happy disposition and continuously wagging tail, it has been given the cute nickname "merry cocker". They can be also dominant and loyal to their companion. Wikipedia