There are three fences in my back yard along the property line. All adjacent. We live in a rural subdivision that was once a cattle ranch. The rusty barbed wire (and oak posts not visiable) are from a fence put up by German prisoners of war during WWII. Later the rancher put in a modern day barbed wire fence with metal posts. I had some free hog panels and attached them to the modern barbed wire to keep the dogs in. Later my neighbor put up the board fence.
A funny story as to why she put up the panel fence. She is quite the farmer girl and has: chickens, horses, turkeys, geese and who knows what else. One day one of the turkeys was close to the fence (prior to board fence). Shadow cautiously approached and the turkey hissed or whatever domestic turkeys do and it scared the heck out of Shadow. It was a big turkey! He ran like crazy. Plus the chickens drove the dogs crazy.