The U.S. Postal Service announced on Thursday that the number of dog attacks on letter carriers had increased in 2016. Above, USPS letter carrier Jamesa Euler delivers mail in Atlanta in 2013. David Goldman/AP hide caption

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David Goldman/AP

Allen Burnsworth, owner of Sit Means Sit Dog Training in Los Angeles, demonstrates how to fight off a dog attack with Flash, a trained 2-year-old Belgian Malinois. Allie Ferguson/NPR hide caption

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Allie Ferguson/NPR

Helping Postal Workers Fend Off An Age-Old Problem: Dog Bites

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The cash-strapped U.S. Postal Service hopes its new Harry Potter stamps will spark enthusiasm among a new generation of stamp collectors. USPS hide caption

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USPS

A U.S. Postal service employee loads his van as he prepares to leave the loading dock to deliver mail from the Los Feliz Post Office in Los Angeles. Kevork Djansezian/Getty Images hide caption

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Kevork Djansezian/Getty Images

Letter carrier Raymond Hou delivering mail on his route in San Francisco (March 2010 file photo). Justin Sullivan/Getty Images hide caption

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Justin Sullivan/Getty Images