Any time you install a dog door in a wall, it's vital that the wall be "framed out" and caulked so that no water or debris can find it's way inside your wall. Very serious problems like dry rot, mold and insect infestation can result from inattention to this point.

If you have the skills to frame the wall yourself, that's fine and you can install any pet door you like in your wall. However, even for the highly skilled, it's easier to use a wall kit provided by the dog door company if they make one. PetSafe does for their "Smart Door".

These wall kits are considerably more sophisticated--and expensive--than usual. Instead of a simple pre-fabricated tunnel in four sections, PetSafe has chosen to mold their tunnel kits which is a very expensive approach. The resulting kits are, however, very nice and easy to use. In addition, they have fewer seams to worry about than the more common approach.

If you want an electronic dog door in a wall, we think this is the best approach.

PetSafe Wall Kit for Large Sized Smart Door

PetSafe Extension Piece for Large Sized Wall Kit - Increases Framing Depth by 2"