Has your dog had a rabies shot before, and if so, how long ago? In my experience - in the USA mostly - the rabies vaccine and booster are the same, we just tend to call it a 'booster' when using it on an animal that's already had it done at least once before because it "boosts" their immunity for a while longer.
I'm assuming you're traveling to a different country, where? Does it require both up to date shots and a titer?
I'm assuming you're traveling to a different country, where? Does it require both up to date shots and a titer?