I have a mystery to solve - I've been working away for a few, my OH has been looking after the aniamls. The day before I was due back she told me she'd lost one of our 12 week old piglets.

She'd looked everywhere, there was no break in the fences, no gaps, the electric fence was working but no pig.
I've come home, done a thorough check of all the fencing - can't find any problems whatsoever, the Mum and her other 3 piglets are fine, showing no signs of attempting to escape, are very wary of the electric fence.
There is neither hide nor hair of him! Have wondered whether it's died overnight for some reason, but where would the corpse go - if a fox took it surely there would be some sign of something.
I don't think it's likely that a person nicked it - I picked the piglets up to move them yesterday and boy did they squeal - it's enough to wake up the dead.
Any ideas anybody?