I had a lacy given to me a few years back and that thing was as wild and skiddish as a coyote... Based on what I saw in that dog, I believe they did originate from coyotes...

That dog also meet the same fate as many coyotes
You mean he strapped a rocket to himself and missed the roadrunner and went SPLAT right into the side of a canyon?

I strapped the rocket on for her, but yeah she went splat!!
I would have a better chance at making a hog dog out of the road runner