Move 'em, Dot. If the sheep didn't each have one eye cocked toward the take pen, I would try flanking Dot, moving her back and forth behind the sheep to break her concentration. That sheep promptly tries to break back toward the obstacle we just passed. The sheep lift their heads briefly and go back to grazing. Gradually the sheep approach the corner and the second obstacle, a single panel in line with the first two, ten feet out from the arena fence on the judge's side.
Dot likes corners.
They help control sheep even better than straight fences. She pushes the sheep into the corner. The sheep seem to find the grass in the corner particularly delicious. They show no more inclination to duck through the gap between panel and fence, where I want them to go, than Dot does to push them through the gap. Even when she finally moves in until she is almost touching the sheep, they merely bunch more tightly in the corner.