In 2363, Hadar was a guest invited to the Bajoran Center for Science on Bajor for a viewing of Odo. Hadar could not stop talking about Odo's amusing "Cardassian neck trick". In fact, he wanted to send Odo out to entertain the troops, whereas Gul Dukat had other intentions in mind for the changeling. (DS9: "Necessary Evil")
For the soldiers of the Dominion, please see Jem'Hadar.