Especially in Canada, there's going to be a large degree of hybridization. Coyotes have apparently also been shown to become more wolf-like (i.e., larger) in territories they have moved into since wolves were extirpated.

I've no real familiarity with taxonomy and am still unclear on whether this animal I recently spotted was a fox or coyote.

(I know the photo isn't good, it was taken at a distance while they were moving around, but I recommend you try not to miss the cub in the background!)