What passport do I need for dual citizenship in Canada?
Your question is not worded well. If you are a Canadian Citizen, you have have dual Citizenship anywhere that you are eligible to be a citizen if they also permit dual citizenship. The UK, for example permits this, and if I were to be granted Citizenship here, I would carry two passports. If you are citizen of another country, and your home country permits dual citizenship and you qualify for Canadian citizenship, you would be a dual citizen if you are granted Canadian citizenship.