I pulled this calf leg and joint out of the entrance to this fox den yesterday. The mole was at the entrance to another hole nearby. No, the fox did not kill a calf! This was most likely a still born calf that was dumped by the farmer (most farms have a location they dump the downers and the entrails).
This hole is at the bottom of a 15-foot gully drop, with a connecting hole at top. The den was dug by groundhogs, and I have taken a few from this location over the last decade or so. Not a great location for a dog unless is is small and can go all the way through. This day, of course, the sette was left alone.