70-year-old Chen Fuyou leading his dog named Gaizhu walks in Longnan City, northwest China's Gansu Province, Oct. 12, 2015. By the end of 2014, the number of the Chinese senior people above 60 years old was 212 million, about 15.5 percent of the country's total population. Nowadays, more and more senior people in China prefer to raise pets that have been proven to make positive contribution to a senior citizen's life. [Photo/ Xinhua]