You could be right, the perimeter of the forest has one, and not far from the road there is an small fenced off area about 20x20m so perhaps they had a small electric fence too.
Funny thing, Liz and I have always had a thing for walking in forests if we can a d last night we ventured in, not to far as it's very uneven but it's nice to get in amongst the trees anyway Liz had been looking up if there were any bears or wolves in France which there are, then she asked me what I would I do if a wolf came after us, so I said I'd run back to the road, then she asked what I'd do if a bear came after us and I said I'd run back to the road, then she said it, you wouldn't be fast enough, I of course replied, I dont have to be fast just faster than you, seems she'd never heard it before and bent double and couldn't stop laughing.