Well, let's see how well Canada does if the US economy collapses... :-/ So far the strong loonie has decimated some industry sectors, I'm surprised things aren't worse overall.
Canada is arguably set up for a harder fall. Household balance sheets are even worse there, and the dependence on commodities could prove to be a disaster in a global economic downturn.
Household balance sheets are nowhere near as bad here in Canada as they are in the US. This is common knowledge so please provide some figures if you've got something that suggests otherwise. We also have stronger banks and didn't get nearly the "deals" that American's got for mortgages.
You are correct about our dependence on resources, but the US is only one of several markets we export to. I'm sure China and India won't mind buying our oil and trees.
Again, a citation is required. Canadian economists regularly state that the D/I ratio is much better in Canada than in the US. (Although it is a cause for concern nonetheless)
Also, given the dramatic drop in US housing values and only a leveling off of Canadian prices, I question your second point as well, at least looking forward.