In 1620, Dodo was conferred the title of an "ejen". He became a "beile" at the age of 13 and was put in charge of the Plain White Banner, and started administrating affairs in the Ministry of Rites and Ministry of War. In 1628, Dodo followed Hong Taiji on the conquest of Chahar, Mongolia, and was granted the title of "eerkechuhuer" (額爾克楚虎爾) for his achievements. The following year, he followed Hong Taiji again on the conquest of the Ming dynasty, crossing the Great Wall and closing in on the Ming capital Beijing.