I had the same exact thing happen to me 5 years ago. When i went to feed the cows (22 beef cows) at a farm that i take care of. Only half of the hay was eaten and the cows were gone. They ran threw two fences (4 wire) and did'nt stop for almost ahalf mile. With the snow on the ground, i could see there were dog tracks all over. I found out the next day that coyote hunters run their dogs threw the pasture. I was pi$$ed.