My parents had the same thing happened, but the yote died and not the dog. After a snow storm, the parents dogs would go nuts every night, dad would yell, dogs would go to the barn and go to sleep. Finally one clear, full moon night, the dogs went nuts again and dad finally saw why. He grabbed the gun and walked outside. His dogs, knowing that shit was about to hit the fan, darted for the barn. Dad shot at the yote and it tore off running. Thought he missed. Took the snowmobile out the next day and found it about 100 yds out in the field, frozen stiff.