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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

President-elect Donald Trump officially opened up his latest hotel in the Old Post Office Building in Washington, D.C., in October. The Washington Post/Getty Images hide caption

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The Washington Post/Getty Images

Scott Schechter, a United States Postal Service employee, collected mail from the boxes in front of a mail processing center on Sept. 16, 2011 in Pembroke Pines, Fla. Joe Raedle/Getty Images hide caption

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Joe Raedle/Getty Images