The Canadian dollar is its own currency with its own central bank, that sets interest rates etc.
Like most countries around the world: it has its own currency.
It has an exchange rate that is different depending upon the country you wish to change it into. For example: Canadian dollars converted to US dollars - the rate will vary. Same if I wish to exchange my Canadian dollar for either the UK Pound, or Euro. The list goes on (name any country).
i cant remember if the canadian dollar is linked to the US dollar, but if it is, i'd want to change to using the Euro pretty quick.
Any reason why you'd change it to Euro, if you were using Canadian currency. Just curious. It's an interesting statement, but isn't clear.
Canadian dollar is accepted around the globe in many places. If it isn't used in day to day trading, it can be exchanged for the agreed upon rate set by that country's bank.