police dog, queue. 警犬, 隊列

No skipping the queue: The six police dogs wait patiently in an orderly line to receive their food. The picture is believed to have been taken in a police dog academy in China
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Chinese police dogs form a perfect line while waiting for their food | Daily Mail Online
http://www.dailymail.co.uk/news/peoplesdaily/article-3125112/Chinese-police-dogs-queue-dinner.html

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