A dog handler hugs his police dog which has completed military service in Jiangsu Armed Police Corps in Nanjing, capital of east China's Jiangsu Province, Nov. 23, 2012. Five police dogs have to leave the corps as their term of military service is due. (Xinhua/Li Ke)

Police dog "Lightning" with its neck tied with a "glory" badge stands inside a door before retiring from military service in Jiangsu Armed Police Corps in Nanjing, capital of east China's Jiangsu Province, Nov. 23, 2012. Five police dogs have to leave the corps as their term of military service is due. (Xinhua/Li Ke)

Police dog handler Jiang Honglin plays with his police dog "Smart" for the last time as the dog has completed military service in Jiangsu Armed Police Corps in Nanjing, capital of east China's Jiangsu Province, Nov. 23, 2012. Five police dogs have to leave the corps as their term of military service is due. (Xinhua/Li Ke)

Police dog "Ba'er" receives the last training under guide of a dog handler before retiring from military service in Jiangsu Armed Police Corps in Nanjing, capital of east China's Jiangsu Province, Nov. 23, 2012. Five police dogs have to leave the corps as their term of military service is due. (Xinhua/Li Ke)

Police dog "Ba'er" receives the last training under guide of a dog handler before retiring from military service in Jiangsu Armed Police Corps in Nanjing, capital of east China's Jiangsu Province, Nov. 23, 2012. Five police dogs have to leave the corps as their term of military service is due. (Xinhua/Li Ke)

Police dog "Smart" receives the last training under guide of dog handler Jiang Honglin before retiring from military service in Jiangsu Armed Police Corps in Nanjing, capital of east China's Jiangsu Province, Nov. 23, 2012. Five police dogs have to leave the corps as their term of military service is due. (Xinhua/Li Ke)

Police dog "Thunder" with its neck tied with a "glory" badge performs upright for dog handlers before retiring from military service in Jiangsu Armed Police Corps in Nanjing, capital of east China's Jiangsu Province, Nov. 23, 2012. Five police dogs have to leave the corps as their term of military service is due. (Xinhua/Li Ke)

A dog handler hugs his police dog which has completed military service in Jiangsu Armed Police Corps in Nanjing, capital of east China's Jiangsu Province, Nov. 23, 2012. Five police dogs have to leave the corps as their term of military service is due. (Xinhua/Li Ke)

Police dog handlers wave farewell to their dogs which have completed military service in Jiangsu Armed Police Corps in Nanjing, capital of east China's Jiangsu Province, Nov. 23, 2012. Five police dogs have to leave the corps as their term of military service is due. (Xinhua/Li Ke) 

 (Xinhua/Li Ke)