How can vaccination prevent rabies in dogs?

Rabies is a deadly disease in many parts of Africa.
But it is entirely preventable through vaccination.
Vaccination protects dogs and stops them from
spreading the disease to other animals - or Worse,
to people.
Epidemiological models have repeatedly shown
that it is economically viable to vaccinate dogs
rather than treating infected cases. A dog
vaccination costs USD 2, while treating a human
Costs around USD 85.