This is a shot of a hand trowelled keyway and reinforcing dowels with a brickledge around the perimeter of a slab. We typically specify a #5 bar dowel 4' in length, set in the slab two feet or not within 3" of the bottom of the grade beam. Note that plumbing is in the brickledge for a hose bib. This is ok in the warmer climate of South Texas. Otherwise we would have the plumber stub the pipe up in line with the interior 2.5" of foam so that they could then use a long frost proof valve and have the dog ear on the face of the inside concrete.