Dolo was appointed as the Protem Speaker by the Governor, Lt Gen (Retd) Nirbhay Sharma, yesterday.
He was administered the oath by the Governor at Raj Bhawan here in the presence of Chief Minister Nabam Tuki and other elected MLAs.
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The swearing in of the newly elected MLAs is likely to be held on June 2 next.
Dolo is among the 11 Congress MLAs who won unopposed in the April 9 Assembly elections in the state.
He represents Pakke-Kessang constituency under Eas Kameng district and won from the seat for the seventh time.