It must be done! Have it your way... If you do not defeat us, you will die!Doga
As his gift of magic from Noah would imply, Doga is a master of magic.
It is possible to obtain the Earth Crystal jobs before fighting Doga or Unei, simply by traveling to the Earth Crystal and fighting the boss there after the party obtains the Fang of Earth. Doing so almost entirely negates the difficulty of the battle.
Behind the scenes
In the Final Fantasy Pixel Remaster, the concept art of Doga is labeled with kana that reads シドモンスター, or "Cid monster".