With this, the 60-member state Assembly now has 49 MLAs from the saffron party, nine from the Peoples' Party of Arunachal (PPA), one Congress and one Independent legislator.
While Waghe polled 3,517 votes, Dolo bagged 3,042, Joint Chief Electoral Officer D J Bhattacharjee said.
While the BJP candidate polled 3,461 votes, the PPA nominee secured 3,156 votes in the constituency, which witnessed a multi-cornered contest.
While Congress candidate Modam Dini could secure only 362 votes, the lone Independent candidate, Sengo Taipodia, bagged 675 votes.
The constituency also saw 23 voters opting for NOTA, Bhattacharjee said.
The Likabali seat had fallen vacant after then health and family welfare minister Jomde Kena passed away on September 4.
The Pakke-Kessang seat fell vacant after the Gauhati High Court declared the election of Dolo from the constituency in the March 15, 2014 polls null and void, following an election petition filed by BJP nominee and former minister Atum Welly.
Union Minister of State for Home Kiren Rijiju congratulated the BJP members for the victory in the bypolls.