"Cocker" in the breed name "Cocker Spaniel" comes from the "cock" part of "woodcock" - the game that the Cocker Spaniel was first bred to hunt, flush and retrieve.
PCH:Wood-Cock Hunter.
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Cocker means to pamper. Many people love to pamper their cocker spaniel. So the name 'Cocker Spaniel' means 'to pamper a dog with long silky hair'. (PCH:Wood-Cock Hunter).
It's quite shocking when their a puppy, just like a baby. They seem to shoot up. But they don't get that big so don't worry :) They grow to be... let me out it this way. When they are fully grown...