Sorry to hi-jack your question timeout,but I feel the need to reply to lankeela!
It's quite contraversial to say that the boosters are unnecessary but the choice is yours.I agree with the BMW comment but you aren't totally against preventative treatment otherwise you wouldn't have had the puppies done. By the time you hear of parvovirus in your area then it must be too late,at least for the dog who has it. Vaccination programs in humans have been very successful (think of the smallpox erradication) and I think that you are putting your dogs at risk from some pretty nasty diseases by not having them done.
As far as the wormers are concerned,even if you inspect their poo,catching a worm means that the eggs would already be there and therefore potentially too late. I know you have a lot of experience but vets must have a lot more knowledge than you however much 'training' you have had in order to sell these drugs,and I can't believe you are advising others not to worm their pets.
Apparently,there are 100 cases a year of toxicara in children and I know this is not a huge number in the grand scheme of things,but if you could talk to just one mother who was waiting in hospital to see if their child's eyes would be permanently affected,you may reconsider!