Dog door installation in a wall is always preferred over lighting in a door as there is still the risk of damaging the design of a door. Dog door installation is a labor-intensive task and can be fairly expensive. However, here are a few elementary steps that need to be followed to install a dog door into a wall:rnrnChoose the right wall, one that is devoid of any electricity or plumbing pipes.rnrnUse the template that comes along with the dog door to mark the measurements on the wall.rnrnCreate holes inside the corners of the wall, using a drilling machine.rnrnStart cutting through the holes, all along the line drawn through the template.rnrnPlace the door inside the cutout. If the door does not place inconveniently, trim the walls as per requirement.rnrnLeverage the screws to place and hold the door, properly through the cutout.rnrnMake sure that the bolts are tight. Ensure proper training of the dog to use the door.rnrnFor further assistance, online videos act as a great help.