http://www.whole-dog-journal.com/issues/13_8/features/Annual-Pet-Vaccinations_20036-1.html
It's been some time now that people have noticed a definite connection between vaccination and autoimmune disorders and certain types of cancer in dogs. The protocols for vaccination have been changed; many in the field now believe that there's no reason to "boost" vaccinations after the first set of puppy shots and that most vaccines provide immunity for the entire life of the animal.
Now if the human medical profession would only start wising up as well!
WE now only vaccinate every 3 years. Every year is too much.