If you are a dual Canadian citizen used to travelling to or transiting through Canada by air with a non-Canadian passport, you will no longer be able to do so as of November 10, 2016. You will need a valid Canadian passport to board your flight.
If your country needs you to enter and exit that country using a passport issued by its government, you will still need a valid Canadian passport to board your flight to Canada. Make sure to carry both passports when you travel.
Exception: If you are an American-Canadian dual citizen with a valid U.S. passport, you don’t need a Canadian passport to fly to Canada. However, you will still need to carry proper identification and meet the basic requirements to enter Canada.
For more information, visit the Canadian Immigration and Citizenship website.