A golden retriever named Mao Mao rests next to its masters at home in Jinan City, capital of east China's Shandong Province, March 10, 2011. The three-year-old Mao Mao has received training to assist human since it was a cub, who now is capable of fetching newspaper downstairs and carrying a basket for its master while shopping in the market. [Xinhua/Lu Chuanquan]