Initially, spaniels in England were divided among land spaniels and water spaniels. The differentiation among the spaniels that led to the breeds that we see today did not begin until the mid-19th century. During this time, the land spaniels became a bit more specialised and divisions among the types were made based upon weight. According to the 1840 Encyclopedia of Rural Sports, Cockers were 12–20 lb (5.5–9 kg). English Cocker Spaniels in UK and USA/Canada have an average lifespan of 11 to 12 years, which is a typical longevity for purebred dogs, but a little less than most other breeds of their size.
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