Having hunted coyotes for decades, I gotta agree with Gunnerboy, that's either a domestic bread dog gone wild, someone's ranch / farm dog, or it's a hybrid cross breed of sorts. The legs and ears look wrong, short legs, wide short ears, short nose, and the tail looks short. He also isn't gated like a yote. And he also looks way to healthy and well fed for a yote. I might be mistaken, but his neck also kind of looks like it may have had a collar on it before?
Did you shoot him within close proximity to someone's farm house or ranch? It sure would be a shame to have shot someone's ranch dog. Out here, much of our public lands are leased to cattle rancher's, meaning that their dogs can sometimes be within close enough distance of a call to come into it. I can't positively say this hasn't happened to me before, I think I've shot one or two, unintentionally of course.
GS