I agree they look like coyote tracks. That was my first thought when I saw them. But I have lived here for 8 years, been out at all times around the clock and have never heard them. My neighbors have never heard them, and my immediate neighbor has lived here for 40 years and was a hunter. I have called in the middle of the night to see if anything is out there and have never heard any coyote chatter. I have however, been outside in my driveway for one reason or another and seen something pass through a shadow out of the corner of my eye looking like the size of a dog, but I would pass it up as it being my imagination.
If this was you, when would you try and call one of these dogs, and what call?
Like I said, I have used interrogation, serenade, challenge, and never heard anything. Have done food sounds too. I haven't seen any predator scat. I looked today since I now know large predators are nearby.