Official statistics do not exist concerning the number of dog that overpopulate the streets of San Paulo, but the problem is prevalent. Especially in the not so nice parts of town. Both stray cats and dogs carry around diseases that are threatening to humans, the most common being rabies. In 2001the problem was so bad that 47 people were attacked every hour according to a study by Brazil's National Health Foundation (Funasa), the Folha de Sao Paulo Internet daily said. So how do we solve this problem? According to statistics, a 70 percent sterilization rate must happen within communities. Meeting this percentage decreases the chances of animal growth in the streets since the chances of an unsterilized female and unsterilized male crossing paths is small.