When I went over the border last year I was asked about pepper spray and firearms and that was it. Cursory inspection and I was allowed to pass.
I wish you could carry pepper spray as I prefer that to a gun and it's useful against a variety of animals whether they be two or four legged.

But pepper spray is considered a deadly weapon to our friends in the great white north.
I have a permit to carry, but I leave the weapons home. I have never needed the use of deadly force in the US and I think Canada is safer than it is here.