Workers check pet food products in a warehouse in Nanhe County, north China's Hebei Province, Oct. 20, 2018. To boost the rural economy, local authorities have promoted the industry of upmarket pet food. By now, a total of 38 pet food companies in the county have realized an annual output value of more than five billion yuan (about 720.7 million U.S. dollars). (Xinhua/Zhu Xudong)