Our area is less than a perfect enclosure.About a 450' perimeter if I recall. Off the south end a good size maple tree stands 10' outside. Limbs are ~ 8' up. So I circled the trunk high up w/ conduit and hung strands of electric fence. Thinking that's where my great hunter got in, that would block that path. But no, back in 2-3 weeks. The back of the fenceline has an old, dilapidated fence.You can just about step over it. It may be enough of base to launch himself in. No digging anywhere. For fence we have 2x4" mesh 6 feet high with barbed wire buried. 12" down from the top I have electric wire 4 or 5 inches out as well as a strand 4" directly above the fence. This weekend at least one security camera will be aimed there.
A neighbor happened to see him the first time when he was inside. She said he got a hen, but couldn't get her back over the fence. We have an area that is covered my mesh too that they can go out in early am before the Great Horned Owl goes to bed. I love the wildlife, but need to keep the kids safe.