On 5/2/2014 happy housewife said: I would take it to a laundromat where they have those triple size washers and dryers and wash it - use tennis balls or laundry balls in the dryer with it to fl*ff it.
ITA.
By the by, Venus, I finally gave up on comforters for the very reason you stated. With two dogs and a cat, it just wasn't worth schlepping to the laundry mat. Most of the time, it seems the extractor machine wasn't working or the large machines weren't working.
That being said, the Laundromat is your best option for very large blankets.
Women and cats will do as they please, and men and dogs should relax and get used to the idea-Robert A. Heinlein