If I were you I wouldn't revaccinate my dog. I don't believe in vaccines in general, and I most certainly don't believe in yearly vaccines. Here is a video you can watch on vaccines. It isn't a sensationalized extremist point of view, it is one vet interviewing another. It is long (about 53 minutes) but it is definitely worth watching. View it with an open mind and take notes to ask your vet about.
http://www.youtube.com/watch?v=L1Xd5ghnlJ4
People can tell you what they would or would not do, but ultimately you need to do what you are comfortable with.