About 6 years ago I killed a coyote that weighed about 60 to 65 lbs. Was he a dog cross? I couldn't tell, but he grew fat on a steady diet of beef.
I was predator managing for a couple of cow outfits.
I hunted one jet black coyote for 2 years until he just disappeared. He had a white patch about 4" around in the middle of his chest. He looked all coyote, but likely had some domestic dog in there somewhere.
The cow outfit I'm working for now has asked me to do predator control and there is a ton of sign, but I haven't seen one single coyote in the month I've been there during the day.
I've seen some big tracks, but no coyotes.
We haven't had wolves in many years, so the bigger coyotes are likely domestic dog crosses.