A handler takes a rest with his dog at a police dog training base of armed police in Harbin, capital of northeast China's Heilongjiang Province, June 10, 2015. (Xinhua/Wang Kai)

A handler cuddles his dog at a police dog training base of armed police in Harbin, capital of northeast China's Heilongjiang Province, June 10, 2015. (Xinhua/Wang Kai)

A German shepherd dog receives the training of sniffing out explosives and drugs at a police dog training base of armed police in Harbin, capital of northeast China's Heilongjiang Province, June 10, 2015. (Xinhua/Wang Kai)

A handler trains his dog at a police dog training base of armed police in Harbin, capital of northeast China's Heilongjiang Province, June 10, 2015. (Xinhua/Wang Kai)

A handler trains his dog at a police dog training base of armed police in Harbin, capital of northeast China's Heilongjiang Province, June 10, 2015. (Xinhua/Wang Kai)

A handler takes care of puppies at a police dog training base of armed police in Harbin, capital of northeast China's Heilongjiang Province, June 10, 2015. (Xinhua/Wang Kai)

A handler trains his dog at a police dog training base of armed police in Harbin, capital of northeast China's Heilongjiang Province, June 10, 2015. (Xinhua/Wang Kai)

A handler trains his dog at a police dog training base of armed police in Harbin, capital of northeast China's Heilongjiang Province, June 10, 2015. (Xinhua/Wang Kai)

A handler trains his dog at a police dog training base of armed police in Harbin, capital of northeast China's Heilongjiang Province, June 10, 2015. (Xinhua/Wang Kai)

A handler trains his dog at a police dog training base of armed police in Harbin, capital of northeast China's Heilongjiang Province, June 10, 2015. (Xinhua/Wang Kai) 10

A handler takes a rest with his dog at a police dog training base of armed police in Harbin, capital of northeast China's Heilongjiang Province, June 10, 2015. (Xinhua/Wang Kai) 11