I think titer testing is a great idea. You give your dog only the vaccinations it needs, when it needs them, and nothing more.

One thing to be careful of, however, is your local laws concerning vaccinations. The city I live near, for example, requires a rabies vacination every two years and a distemper vacination every year - no exceptions.

It is sometimes harder to find a vet in a rural area that will do titer testing. But in a city it should be no problem. And, since titer testing usually actually costs more than the vacinations themselves, I can't see too many vets having an issue with it.