Dogbreath ain't lyin' about barking a coyote. I have never seen it fail. But like he says, it may not stop it for long so you better shoot right fucking now.
Again, let me take this call to push Dogbreath's calls. They are some of the best calls I have ever used. Go to his site and buy one or more and see for yourself. He also has a few instructional videos that are well worth watching. He's as humble as he is a good hunter. Great guy.