statistics seem to highlight a problem.
38 U.S. fatal dog attacks occurred in 2012. Despite being regulated in Military Housing areas and over 600 U.S. cities, pit bulls contributed to 61% (23) of these deaths. Pit bulls make up less than 5% of the total U.S. dog population.
http://www.dogsbite.org/dog-bite-sta...ities-2012.php