My one dog hasn't been vaccinated for anything other than her 3 year rabies for almost 7 years now. I ran a few titers over the years and she never needed anything. She's 9.5 now and most likely will never be picked by another needle for the rest of her life.
Vets will try to pressure you into it but they can't force anything.
When I get questioned about not doing things like heartworm or preventative vaccines, I have my own very valid reasons and alternatives to pumping my dogs with either chemicals or viruses that I have come to with full support of my vet ( thankfully i have one that doesn't pressure but educates)
Courage is being scared to death and saddling up anyways. ~John Wayne