"Vaccines should not be given needlessly. Core vaccines should not be given any more frequently than every three years after the 6- or 12-month booster injection following the puppy/kitten series, because the duration of immunity (DOI) is many years and may be up to the lifetime of the pet." WSAVA Vaccination Guidelines 2016
"The VGG (WSAVA Vaccine Guideline Group) strongly supports the concept of regular (usually annual) health checks which removes the emphasis from, and client expectation of, annual revaccination." WSAVA Vaccination Guidelines 2016
The WSAVA (World Small Animal Veterinary Association) Vaccination Guidelines for the Dog & Cat, 2016 (you can read the executive summary and the full version here).
The NZ Gribbles Veterinary Pathology Laboratory guide to Canine Titre Testing.
Veterinarians: To find out more about in-house titre testing, contact Ian Denby at Animal Solutions.
Interview with Dr Ronald Schultz (co-author of the WSAVA guidelines) about safe and effective vaccination.
Talk to your vet about individualising your pet's vaccination programme.