Black Mouth Cur fights huge male coyote

This is why I wanted a BMC. No fear in their hearts... That's what you call a Decoy Dog. That's a good dog right there...

To me, from a predator calling perspective, a decoy dog is any dog that draws the coyotes attention away from the caller to it itself [the dog] and helps the hunter put more fur on the ground. That is a very generalized description because every hunter is different and every hunter uses their dog to compliment their style of calling.