From Roland Kays in The Conversation: “Yes, eastern coyotes are hybrids, but the ‘coywolf’ is not a thing”.
Coyotes in the Northeast are mostly (60%-84%) coyote, with lesser amounts of wolf (8%-25%) and dog (8%-11%). Start moving south or east and this mixture slowly changes. Virginia animals average more dog than wolf (85%:2%:13% coyote:wolf:dog) while coyotes from the Deep South had just a dash of wolf and dog genes mixed in (91%:4%:5% coyote:wolf:dog). Tests show that there are no animals that are just coyote and wolf (that is, a coywolf), and some eastern coyotes that have almost no wolf at all.
In other words, there is no single new genetic entity that should be considered a unique species. Instead, we are finding a large intermixing population of coyotes across the continent, with a smattering of noncoyote DNA mixed in to varying degrees along the eastern edge. The coywolf is not a thing.
Sounds a little like humans around 45,000 years ago…