Combine 1 cup flour, yeast, sugar and salt in a large bowl. Add water and oil; mix until well blended, about 1 minute. Gradually add enough remaining flour to make a soft dough. Dough should form a ball and will be slightly sticky. Knead on a floured surface, adding additional flour if necessary, until smooth and elastic,about 4 minutes. Spread dough on a pizza pan. Form a rim by pinching the edge of the dough.
Spread ranch dressing over pizza crust. Top with bacon, chicken and cheese.