Kotaku
1Up discovered an interesting tidbit over at the Entertainment Software Rating Board. If you do a search through the ratings for Nintendogs, you'll come up with four not three hits. The unannounced fourth title is something called Nintendogs(Holiday Edition). I would assume this edition would be about new breeds of dogs, since it wouldn't make sense for Nintendo to come out with another cart just to get some Santa hats or jingle bells out to Nintendogs, but I can't think of any particularly festive breeds.
ESRB Game Ratings [ESRB, via 1Up]
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