Defensor is an inactivated rabies vaccine for healthy cattle, sheep, cats and dogs 12 weeks of age or older as an aid in preventing rabies providing at least 1 year of immunity after a single dose. It is a killed virus vaccine containing a specially selected rabies virus strain developed from Louis Pasteur's original 1882 isolate. Helps the animal's immune system build a defense against the rabies virus. For use in animals 12 weeks of age or older.