We tried some of the small garden barriers that are innocuous to the eye and generally effective in suggesting to the dogs, "don't go there." That was until a few vehicles backing out of the driveway at various times battled with the fences and proved victorious. When Junior was here last spring he fashioned a rudimentary wooden barrier. It has also battled with autos but has proven a tougher warrior than its predecessor. Even so, battle scars are apparent. The whole scene is unsightly. And yes, it needs weeding badly!
So, we are very open to suggestions on what to do with this space that will be attractive for us humans, and less available to the dogs for their purposes (entertaining as Rigel may be when he romps). Ken keeps suggesting a picket fence, but the proportion and location are all wrong, not to mention that we then have no access to the area to maintain it.