by 
The Curious Bag
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<h4 class="dechead">On One Hand: Two or More Required
A pet that has had two vaccinations in its life is typically still protected from exposure, even when its current booster has expired. Falling behind on a pet's vaccination schedule can cause the animal's antibody levels to decline. In terms of rabies prevention, an immediate booster dose after a bite from another animal will likely bring a rapid rise in antibody titers and protect the animal.
On the Other: Case By Case Basis
An animal that's not current on its vaccines can still contract the disease. Pets with expired rabies vaccinations will need to be quarantined and examined by a veterinarian. In some instances, an exposed animal with expired vaccines will have to be put down.
Bottom Line
Making sure your animal's vaccines are up-to-date is the best way to protect your pet from diseases such as rabies. While a pet with past inoculations has a good chance of surviving a rabies attack, it's best not to take chances with the animal's health. In some cases, an updated vaccine schedule can mean the difference between life or death for a dog or cat.
Source:
Centers For Disease Control's Rabies Resource Page
Resource:
American Veterinary Medical Association Tips On Rabies Prevention
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