Coy dogs get huge, look just like a coyote. Outside Iva, SC, a friend killed one that I weighed at 73 lbs. He is 6'4" and holding the coyote up as high as he could stretch his arms, the coyotes feet were barely off the ground. I called the Wild life biologist and she said that the coy dogs in our area get huge but that one was unusually large.
I have a picture somewhere of him holding the coyote, the girth on that coyote is something that was hard to believe.