FYI. I saw this today and when I passed it on discovered a number of my friends who are dual citizens but do not have a Canadian passport and were surprised to find this out
Dual citizens heading home for holidays need Canadian passports
It's a side effect of the electronic authorization program used to screen people coming into the country. It can not be used by Canadians who are dual citizens so they need to have a Canadian passport to fly into the country.Since November, dual citizens who hold Canadian citizenship have been required to show Canadian passports if they want to fly back into the country.