By the 1930s, Cocker Spaniels were the most popular breed in England. However, the breed still had one further development phase to undergo, as breeders in America bred American-type Cocker Spaniels in the early part of the 20th century. These were smaller, more show oriented dogs, yet the two lines competed against one another in America. Eventually, in 1946, the American Kennel Club (AKC) designated the English Cocker Spaniel as a separate breed from its American Cocker Spaniel cousin.
In the last 50 years the breed's popularity has extended worldwide, and it is often cited as the most popular spaniel in Europe, if not worldwide.