Loyal pet Border Collie performs CPR on 'unconscious' owner

This is the heartwarming moment a loyal pet Border Collie performed CPR on an 'unconscious' owner.

The holidaymaker pretended to suffer from altitude sickness and collapsed to test Wula, the four-year-old male dog dressed in a yellow jacket, to see how he would respond in a mountain in Kangding, Garze Tibetan Autonomous Prefecture, Sichuan, China on July 27.