The run fence is six feet high with a netted canopy over the top so nothing can get in there. As far as fences between properties, ours is a quite high wooden privacy fence that runs along where their property meets ours. We don't have a fence going all the way around us. The neighbor's fence is the problem. The fence that runs along the back of their property is about waist-high, wire and post, and in very poor repair. That's where their chickens are getting out, walking through the woods that is at the back of both of our properties, and entering our yard. To complicate matters, the woods belongs to neither of us and the neighbor's property is a rental that they are not responsible for maintaining.
All that said, I might start by just getting the folks next door a nice quality rooster leash and hoping they take the hint, rather than jumping straight into making this a whole big official neighborhood squabble between us, them, the rental property owner, and the folks who own the woods.