If you get it from any carrier in Canada, it'll be single sim.
You could order a dual-sim tray for the phone online (ebay), but the second sim slot in the tray wouldn't connect the sim card to any connector inside the phone, meaning it'd be a space to store a sim card when travelling.
Carriers in Canada allow you to subsidize (usually) carrier-locked (always) single sim phones because they want to be the only network on your mobile phone.
I realize dual-sim phones would be useful for those who travel to the US frequently and/or live in border cities and would benefit from receiving SMS and seeing missed calls while roaming while utilizing a local provider for their other sim card. If you really want a dual-sim phone, consider Asus, Xiaomi, Lenovo, Letv, etc.