Ohh dear, so sorry.
Just a thought, have you put up a notice in the Mairie, local shop, bar and even spoken to the school in the village, if you have one, as kids on their bikes get everywhere and its surprising what they come across if you offer a reward!!!
Also neighbouring villages, a pig can wander a great distance and they don't wear a watch so are never conscious of time and distance!!
Hope he comes back soon and if you need a hand give us a shout as we aren't that far from you.