Sources:
FOTW:http://www.crwflags.com/fotw/flags/mn-prov.html#dornod
Vexilla Mundi:http://www.vexilla-mundi.com/mongolia_divisions.html

Real usage photo from official site:http://www.dornod.mn/audit/images/stories/s6300037.jpg
Own work
Dalakop