According to the United States Postal Service, 40 letter carriers in Louisville were attacked by dogs in 2010. That makes us 4th on the list of cities with the most attacks. The Postal Service says 5,669 postal workers were attacked nationwide in 2010. The announcement coincides with National Dog Bite Prevention Week (May 15-21). The annual event seeks to raise awareness for attack prevention and responsible pet ownership. Around 4.7 million Americans are bitten annually, most of them being children.