I agree go with the medium. I've bought too small sweaters before and it looks ridiculous. Also I wouldn't worry about it shrinking when you wash it. Most dog clothes are made of synthetic fibers which don't shrink.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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