Cut bacon slices in half, and wrap each half slice around a shrimp, securing with a toothpick.
Repeat until all shrimp are wrapped in bacon.
Heat a non-stick pan on medium heat and cook shrimp, turning once, until cooked through, approximately 6-8 minutes. When cooled enough to handle, remove toothpicks.
Toss spinach and red onion together with 2/3 of the dressing, and season with salt and pepper.
Plate salad by adding spinach mixture to the center of the plate, topping with blue cheese, and arranging shrimp around the sides of the salad.
Drizzle shrimp with remaining dressing and serve.