Sniffer dog "Hei Sa" and its instructor Jiang Feng (1st R) carry out a patrol mission in Baishan, northeast China's Jilin Province, June 22, 2020. Sniffer dog "Hei Sa" has stayed with its instructor Jiang Feng for half a year. While off duty, "Hei Sa" is an adorable springer spaniel. However, when it comes to drug detection missions, it will turn into a black and valiant warrior as its name in Chinese suggests. Together with ten other police dogs and their trainers, "Hei Sa" works for the first anti-riot and drug-detecting police dog squad in the borderlands of Baishan. The major tasks of the squad include drug-detection, patrol, tracking and examining suspicious items. The police dogs have gone through intensive training under their instructors and become reliable canine comrades in multiple border missions. (Xinhua/Xu Chang)