Soldiers and patrol dogs jog during early-morning exercises near the Erenhot frontier station, Inner Mongolia autonomous region on March 23. Located near the China-Mongolia border, Erenhot is renowned as the biggest inland port city in Inner Mongolia. The soldiers are responsible for border security and conducting patrols, inspections, and quarantine procedures at the entry-exit station. [Photo/people.cn]

Soldiers and dogs line up for training at the Erenhot frontier station on March 23. Established in August 2005, the patrol dog team at Erenhot frontier station conducts routine check on freight trains and vehicles crossing the border. The team has confiscated pilose antler and illegal drugs during the routine check. [Photo/people.cn]

Soldiers train dogs to confront criminals when commanded on March 23. [Photo/people.cn]

A patrol dog checks for illegal drugs in luggage during a training at the Erenhot frontier station on March 23. [Photo/people.cn]