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Rear freehub is gone on my 10 month old stumpjumper. Would this be
Covered under warranty? If so can any specialized dealer do it or only
The shop it was bought new from?
Depends but it is under a year so i would expect it to fall under the usual 1years parts warranty, and also to be Sale of Goods Act, Technically you should go through the dealer you bought from, and they might want to see a receipt. Just to prove you bought the bike, first hand, haven't nicked it etc etc.
If you can't get to the seller it can't hurt to ask at a different dealer but that would be a purely warranty approach, Any SOGA approach is contractual, ie with your direct supplier.
Sould be under warranty spesh hubs have troublesome freehubs at the best of times.
Wow - 10 months! You did really well, mine was gone in 4 
Think im gona skip them an invest in a set of hopes!
any specialized dealer can sort it if they want to.
just had 6 year old frame replaced by a different dealer than the one i bought it from.