On the other hand, if the dog is registered with a country other than the United States, the term Cocker Spaniel will refer to the English Cocker Spaniel. General Description. English Cocker Spaniels are most often confused with English Springer Spaniels and American Cocker Spaniels. American Cocker Spaniels. American Cocker Spaniels have round eyes, a rounded skull, a more pronounced stop, and a shorter muzzle than English Cocker Spaniels.