When you take your dog to another country, the legal requirements are variable and depend both on target country legislation (as indicated in your first link) and the type of vaccination. In Europe the vaccination validity is 1, 2 or 3 years.
There are some studies on the duration of rabies vaccination, but limited to 3 years. Beyond that period, there is no evidence that the vaccination efficiency decreases.
- "Are we vaccinating too much?" by R.D. Schultz,
- "Current and future canine and feline vaccination programs" by Feline Medicine, 3 mai 1997, Montréal, Québec.
- Dr Gary Norsworthy, conférence de l'Académie de Médecine Vétérinaire du Québec;
- R. B. Wilson and others, "A neurological syndrome associated with the use of a canine coronavirus-parvovirus vaccine for dogs",
Compendium on Continuing Education for the Practicing Veterinarian,
vol. 8, 1996, p. 117-124.
From Source1 (Schultz)
To ensure that all pups become immune, one dose of rabies vaccine is
given at 12 weeks of age or older, followed by a second dose 1 year
later, or at 1 year of age. Revaccination is then done at 3 year
intervals. Similarly the CPV-2, CDV and CAV vaccine could be given at
1 year and then every 3 to 5 years without concern about loss of
immunity. There is no evidence, or reason, to believe that
revaccination with the core vaccines more often than recommended above
would provide more effective protection from the important diseases
since the minimum duration of immunity from the core vaccines is at
least 3 years. States in the USA which require annual revaccination
for rabies should remove those requirements because annual
revaccinations are unnecessary.