Some animals aren't going to respond and there isn't anything you can do about it.  I've done titer studies back in school vaccinating cattle and seen the data first hand regarding responses after first injection and then the booster.  I think the 100% effective thing is probably for those that will respond.  I also work for a biotech company where we boost goats with human antigens for anitbody production.  We measure the titers every month.  There are some that never respond well and aren't used for production.

Pfizer may not lobby your local government, but who is your local government getting the suggestion for the protocol from?  What are the Veterinarians profit margin on giving a rabies shot?  It can't hurt the animals to give it every year, but it's certainly very profitable.

Titers are not necessarily a good test for long term immunity.  They are great for testing the response of a vaccine, but they are only testing for present antibodies.  The serum is mixed with the antigen in the analyzer machine at the lab.  My experience is with a Hitatchi 717 and 911.  The body is not given a chance to react to the challenge with the memory cells with a titer test.  Memory cells are for long term immunity, they are essentially at rest until challenged.  Once challenged they will release the antibodies to destroy the challenge.

My wife just sent me this link:

http://www.rabieschallengefund.org/