Police dogs are on duty to ensure safety during the annual Spring Festival travel rush at a railway station in Nanning, the capital city of south China’s Guangxi Zhuang Autonomous Region. /CFP Photo

Eight-year-old Labrador Retriever “Taisen” has been patrolling and inspecting for suspected articles at the station for seven years, and this will be his last year on duty. /CFP Photo

Highly stressful work requires “Taisen” to walk some 20,000 steps starting from 8 a.m. every day so it requires calcium supplement sprayed to ankles at night to protect its joints. /CFP Photo

The annual Spring Festival travel rush in China, dubbed as the greatest migration on the earth, is expected to see almost 3 billion trips made in the 40-day period this year. /CFP Photo