They are rare, BUT if a male coyote breeds with a dog, you end up with the coydog. Even more rare is when the male dog breeds with the female coyote, and there is another name for them, but I can't remember what they are called off the top of my head. The only way to really know if a critter is truely a coydog is by DNA testing! There are coyotes that look much different than a normal coyote that aren't anything but a coyote!