I don't know, but until you can find an AUTHORITATIVE answer somewhere, I would leave it published.
Things to consider are:
1) If you have a lot of Hubs, a few dogs won't hurt you all that much.
2) IF, IF Google considers age you would have to start over in getting Google respect for it if you take it down then republish.
3) Would HubPages consider it a duplicate when you republish next year? Can you use the same URL? Or would you have to get another one? I tried to post a Hub here, of content that I had on an old discontinued website of mine that has not even existed (been hosted) for way over a year. Yet HubPages flagged it as "duplicate" because it is in the Google search archives.