Click on either of these images to read the rest of this extremely short (200 words) and to-the-point piece on the importance of vigilance if you have a dog in a coyote area.
Note: The article, in its shortness, or possibly because of a misunderstanding by its author, is missing some important points. Most important, coyotes avoid humans, so if you don’t have a dog with you, just keep your distance to help yourself and the coyote not feel crowded or threatened. And, even if you have a dog with you, you would never challenge a coyote as described in this article unless it had come very close or was coming directly at your dog. Otherwise, leash and walk away, and always keep your distance. The point is to avoid any interaction and a confrontation always.
Coyote Yipps 
