Democratic 2020 U.S. presidential candidate and former U.S. vice president Joe Biden interacts with a dog named Roxy during a campaign event in Las Vegas, Nevada, U.S., February 15, 2020. REUTERS/Eric Thayer

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Democratic 2020 U.S. presidential candidate and former U.S. vice president Joe Biden interacts with a dog named Roxy during a campaign event in Las Vegas, Nevada, U.S., February 15, 2020. REUTERS/Eric Thayer