A sniffer dog works at the Hangzhou Xiaoshan International Airport in Hangzhou City, East China’s Zhejiang Province. Customs authorities at the airport have six sniffer dogs to assist with quarantine inspections. (Photo/IC)

A sniffer dog works at the Hangzhou Xiaoshan International Airport in Hangzhou City, East China’s Zhejiang Province. Customs authorities at the airport have six sniffer dogs to assist with quarantine inspections. (Photo/IC)

A sniffer dog works at the Hangzhou Xiaoshan International Airport in Hangzhou City, East China’s Zhejiang Province. Customs authorities at the airport have six sniffer dogs to assist with quarantine inspections. (Photo/IC)

A sniffer dog works at the Hangzhou Xiaoshan International Airport in Hangzhou City, East China’s Zhejiang Province. Customs authorities at the airport have six sniffer dogs to assist with quarantine inspections. (Photo/IC)