This is information from the Ontario MNR.
The coyote in Ontario is a cross of Western Coyote and the Eastern Wolf.
Because of the mixed ancestry appearance varies greatly.Animals that look like dogs have no dog DNA when tested.
Known coyote/dog crosses are highly infertile,the males don't help raise the pups unlike the wolf/coyote crosses and female coydogs drop pups in the dead of winter.Two months ahead of the wolf or coyote.That is if they can even breed.

The trappers I deal with here in Southern Ontario were submitting DNA from all their kills to the University of Guelph and never had one with dog in them.

Glenn