The washed-out gap closes and stays closed
On a slope, runoff scours soil out from under the bottom rail and opens a gap a dog slips through — and the posts on either side can be perfectly solid, which is why a simple board patch keeps failing. We step the run tight to the regraded grade, key a footing in at the low point where the water concentrates, and reshape the swale so the runoff sheds along the fence instead of under it. The gap closes because the water finally has somewhere else to go.



