Beyond photography, Dong and his partners gradually evolved toward nature documentaries, beginning around 2015, hoping to showcase the charms of wildlife through more diverse formats.

Over the past decade, he has been involved in the creation of around 10 wildlife documentaries. The mountains of Southwest China remain the central focus of these works.

Of these documentaries, Dong is most fond of The Glories of the Minya Konka (Mount Gongga), completed in 2018. Through precious, on-location footage, the documentary tells the story of Mount Gongga, the highest peak in the Hengduan Mountains of western Sichuan, at 7,556 meters above sea level. It captures the coexistence of snow leopards and leopards, the spectacular giant tree of Magnolia dawsoniana and monkey troops seasonally feeding on the flowers, and the courtship of golden pheasants.

In January 2020, the documentary was broadcast on Central China Television and received an award from the National Radio and Television Administration.

Because of these works, Dong is considered one of China's leading nature documentary directors and producers.