
Hi tadog, as Debussy says once dogs have immunity then they shouldn't need any further vaccines. So titre testing is a good way of knowing whether or not a booster is necessary. Not all vets are forward thinking though and will just do as they have always done and vaccine every year regardless. So you have to insist on a titre test which all vets CAN carry out. The blood sample will be sent away and you should get your results in about 10 days. (the same way as titre tests for rabies are sent away) so if it works for rabies and pet passport then why not all the other diseases?
Some vets administer parvo and distemper vaccines every year and the manufacturers say every 3 years. Lepto on the other hand is only effective between 3-7 months and doesn't protect against all the strains found in the uk so even if a dog has a lepto vaccine (and this is the most likely vaccine the dog reacts to) they are unlikely to be protected, so not worth having anyway. And I have that advice from an expert in the field.
Kennels, I have found a kennels that accept either high titre test readings or homeopathic nosodes, so they are around if you search.
Might be worth having a look at Catherine O'Driscoll's website she has recently brought out a new dvd it makes interesting viewing, the views of experienced vets who are now against over vaccination,
http://www.canine-health-concern.org.uk/Many of us who have seen a dog suffer from adverse reactions and many of us have had dogs die from them, as we also love our dogs we want to do the best for them and keep them safe, so it is important that you find out all the info that you can and make an informed decision for your dog, it isn't easy, there is lots of conflicting advice around as you can tell from this thread.
The best protection a dog can have against these diseases is a healthy immune system and the best way of ensuring this is to feed a healthy diet and not to bombard their systems with chemicals.