Mine does fine... swims through skim ice, retrieves birds, he don't care... lolI can't imagine waterfowling with a German short hair....they have no fur to protect from cold water. The dog would probably freeze to death in 30 degree air.
ETA: If I only wanted a winter retriever, I'd opt for a lab, but I want a versatile dog... the Weims, GSP's and Vislas fit this bill to a T..