Police dog Duo Duo sits on the hind legs with the front pawing up as a way to make salute to its handler Wang Xule who retired on November 28, 2017 in Siyang county in East China's Jiangsu province. The dog did the posture spontaneously when it met Wang, who participated a retirement ceremony on Tuesday, as if it knew it was the time to bid farewell to the old partner. (Photo: China News Service/ Wu Jiahong)
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