I didn't reply to your contention that wolves and dogs are the same species. They share such a recent evolutionary origin - and their separation is driven by human mating so much that it makes for a less precise delineation.
I did reply to your contention that wolves and coyotes are the same species. They are not, any more than tigers and lions are the same species - despite the fact that they can produce fertile offspring.
The Eastern Gray Wolf has been thoroughly examined with in depth DNA evaluation and it's a mix of coyote, dog and wolf. Seems pretty successful too ~ not your incidental mating but a full fledged wolf-dog-ote!
These critters we're talking about are RACES ~ not even subspecies.
A Jackel is a subspecies of the same species as the wolf-dog-ote!