Apologies in advance to all the dog lovers out there. However, the fact remains that dogs kill around 25,000 people every year. This is not because they are vicious or agressive but because, in many countries, dogs are not vaccinated against Rabies.
When dogs contract Rabies, they get out of control and attack and kill humans. A human being contracts Rabies from an infected dog bite and dying from Rabies is one of the most dreadful ways in which to die. Obviously, in the developing world, you are far more likely to encounter a Rabid dog and die from a Rabies bite.