Lankeela and Yvonne M- I am concerned about your advice given here.
Normal dog vaccines include vaccinations against:
Distemper.
Hepatitis
Parvovirus
Parainfluenza
Leptospirosis.
Antibodies (protection) from the intial set of vaccines last a variable length of time in each individual animal, but a year is about average. Therefore it makes no sense to only have the injections once and then never again - this is particularly true with regard to leptospirosis.
Newer vaccines are changing and some may advocate once every 2-3 years for all but the Lepto part. This still needs to be done yearly.
Worryingly I have seen 2 cases of Parvovirus this year in dogs that had puppy vaccines and no further ones. One died and was 5 years old. The other one survived.
I feel concern about the word "conned" used - honestly, these vaccines are given for a reason!! If everyone had their dogs vaccinated, we would probably see the end of some of the diseases listed above.
Another note to all - pet care is not like a supermarket - cheapest it not always best. Find out what you get for the price and find what the practice will offer you.
For example - if you have your vaccine and your pet has a problem with it - is there a vet on call, or are you expected to go to an emergency clinic, which may be several miles away!