Hi hollyhedge
Sorry to hear the hogs have gone missing. Apart from the reasons for missing hogs already mentioned above, they could be absent if they were having hoglets.
i.e. if the nest is a bit further away, the mother hog may not want to leave her young for too long and so forage nearer to where her nest is. When I was studying the hogs round here for a few years, I found that that the females (who normally turned up regularly every night at other times) used to go missing for, maybe, a couple of weeks. But would then return and carry on visiting every night again as they had done previously. I didn’t know for sure they were involved with hoglets, but thought that was feasible. But whatever the reason was, those roughly 2 week absences used to happen.
I would keep leaving the food and especially water (all day every day) for them as a hog could turn up again any time.
Good luck. Fingers crossed the hogs return and maybe some hoglets later on.
