Ashley, basically they are tow different breeds- I am not sure what breeds were used to create the American Cocker but it is not, to my knowledge , used as a Gundog, so it has lost a lot of the attributes- such as a greasy, non-shedding coat. The English Cocker is also no longer used as a Gundog- it is supposed to be and there may well be a few working strains left but it is now, essentially, a pet. There is a breed called the"Working Cocker" that was bred using any spaniel that could work well and takes the place of the Cocker Spaniel in the working world.