Are the requirements any different under DEFRA/PETS for puppies coming from rabies-free countries? What is the earliest age puppies can be vaccinated for rabies in Europe? Here it is 3 months/12 weeks. In the case of imported puppies, they aren't supposed to leave the owner's residence until 30 days after the vaccination (quarantine period)...really a very silly rule, since rabies is all over the place in the US (in nature, mostly - raccoons, foxes and skunks), and it is a very, very difficult, almost impossible federal regulation to enforce.
No titer is required to test for the effectiveness of the vaccine at any point, like it is in Europe.