Cocker Spaniels typically reach their full height of between 14 and 15 inches at the shoulder within about six months. When fully mature, Cocker Spaniels average between 20 and 30 pounds and have a 12 to 15 year lifespan.
Cocker Spaniels were bred to be hunting dogs. Today, the breed consists of the American and English Cocker Spaniel. In the United Kingdom recognized the American Cocker Spaniel as a separate breed beginning in 1970. Cocker Spaniels suffer from a variety of common health problems including hip dysplasia and ear infections. In 1999, the Cocker Spaniel was ranked the 13th most popular breed, according to registration statistics of the American Kennel Club.