do i need the dock to charge my 2nd gen ipod shuffle

It needs to be the USB docking cable it came with, or a compatible third-pary replacement. This is the Apple part

http://store.apple.com/us/product/MA694G/A/apple-ipod-shuffle-dock

There are third-party alternatives, but make sure it is described as being for the 2nd gen shuffle. The USB cable for the 3rd and 4th gen shuffle does not work with the 2nd gen shuffle, because the connector is different.

Technically, there is no 5th gen iPod shuffle. 4th gen is the latest model for shuffle. As I said in the previous reply, the USB docking cable for the 3rd and 4th gen shuffle does not work with the 2nd gen shuffle, because the connector is different.

(If by "charger" you mean the USB power adapter that plugs into the wall outlet, the ones that Apple sells should work with any shuffle.)

i ordered the dock

do u know if 5th gen charger will work