I've seen yogurt and yoghurt spellings here in English Canada, but never yogourt. Of course, you do see it all the time on the packaging, but that's because that's the French word for yoghurt, as in "Fresh Yoghurt/Yoghourt Fraiche!"
You can put Canadian in with the UK and Australian. It's the 'official' way it's supposed to be spelt, but both are used commonly. I'm a bit of a traditionalist for a Canadian when it comes to that stuff: it's colour and flavour.
Oh, and that's just the French word for yoghurt; there's nothing particularly québécois about it.
There is English Canada and Quebec, s'il vous plaît
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