For nearly 20 years I haven't given annual shots to any of my dogs. It has been proven that annual shots contribute greatly to immune related illnesses in dogs and cats. For the first 10-12 years we gave boosters every 3 years, then additional research indicated that most all shots give lifetime immunity. If you are concerned about the efficacy of your dogs immunity to certain diseases you can ask your vet to do a titer test to ascertain the level of protection. In my state I still have to give rabies every 3 years.
I have 8 healthy dogs in my house and when we lose one it is usually to old age (some around 16 years.) We also tell our puppy buyers to save themselves some money and NOT vaccinate after the 3 puppy shots (except for rabies as it is the law.) And if their vet "requires" annual shots to do themselves and their puppy a favor and find a new vet.
Annual boosters are a huge $$$ to vets and many don't want to give that up. Plus, by giving annual boosters they know that many of their patients will be back with a more serious illnes (often the result of too many vaccines.)
Consider this - did you or your children get annual boosters for life?
OK = off my soapbox. PM me if you need additional info.