Will Falconer, DVM Moderator
Good question, Erica. I got the feeling from this research and the Compendium that it's the vaccine inducing the dog's rise in antibodies that is the treatment of choice.
My guess is that's because the dog has been (presumably) primed with a vaccine earlier in life, so they'll jump into gear and rapidly make antibodies with a booster vaccine, whereas people have likely not been vaccinated for rabies, so they wouldn't.