[KendraE]

Thank you all for your replies. I am going to call my vet this morning to ask about the titer test. I feel foolish I didn't know anything about them! Thanks for the link, Lisa. I think this is the best way to determine if he needs the boosters. On the downside, that still means he will need a trip to the vet which makes me cringe! I hate for him even to breath the air where so many sick animals have been! Taylor brings up a good point about the other yorkies and ourselves bringing in germs at home as well. A lot to consider. I will keep you posted on what the vet has to say! Have a great weekend!