Another cow through a fence

What is going on with my cows?   Several days ago no cows through or over a fence.  So I thought I was done with this behavior.  Today I found a cow in the south pasture.  A different cow than the previous one.  And a different pasture.

This was a bigger cow so it didn't make it over the fence.  And this fence doesn't have an additional wire fence.  So the top three barb wires were either broken or pushed down by the cow as it went over and through the fence, and one metal fence post pushed to lean.  I had partially straightened the fence and post when I took the photo.

The cow was standing near where it had gone through the fence.  I opened the south pasture gate so the cow could go and join the rest of the cows.  The rest of the cattle were in the NE part of the middle pasture by the gate to the north pasture.  They weren't near the hay bale I had placed in the middle pasture on Sunday.

Before dark I fixed the fence and tightened and reattached the barb wires to the fence posts.  By the time I was done it was too dark to go walking about to see if I could see other tracks in the snow.  Tracks other than one made by cows.  I'm starting to think something is chasing these cows through and over the fences.  A dog?  A coyote?  Something else.  Maybe even Bigfoot as Donna is fond of Bigfoot.