HOME: What's the best way to install a pet door in an exterior wall? [solved]
I want to install a pet door to allow my dog to let herself out. The door would run out onto a deck attached to the back of the house. On the wall connected to the deck, I have a sliding glass door and enough wall space that the pet door could be located in a bunch of different situations. So the question is, what would be the preferred location/installing method?
- In the sliding glass door itself? (Seems difficult if not impossible)
- In the wall next to the door, between studs? (Cutting through drywall, insulation, and the exterior wall/siding)
- In the wall centered on a stud? (Not sure how much this would differ from option 2)
Once the hole is made, would you frame around it? Do they sell pet door designed for exactly this (vs placing in an existing metal or wood door)?
Looks like they do sell pet doors for that purpose. You can even pick the size.
As far as installing it, I think the last thing you want to do is center it on a stud.
I would go with an in-wall installation - since you live in Fargo, you're likely to want the extra insulation it can provide.
PetCo carries the Perfect Pet All Weather Series Insulated Pet Door and has a "wall kit" that boxes in the area of the hole.

(source: petco.com)
Something you might have to take consideration of, depending on the wildlife in your area, is that other animals may figure out how to use the door to get in your house. There are different types of electronic doors that you can get that have a tag you put on your dog's collar to allow them in and out.
Our door is a more basic version of the PetCo one I linked above, but has a sliding panel on the inside that closes the pet door. Unfortunately, one of our dogs is afraid of the plastic flapper, so he won't use it.
My in-laws have a sliding glass door pet door. The door fits inside the track of the door. It works well for them. Perhaps you should check it out: http://www.amazon.com/PetSafe-Deluxe-Panels-Sliding-Medium/dp/B000633RX8
It matches the height of the sliding glass door. The model they have has clear glass so you don't lose visibility. Other models may be completely plastic on the inside with an aluminum frame.
It can be removed because it has a spring catch at the top which you use to fit it to the door. Imagine it cupping the upper track and you can slide it up/down with your hand. This is the least intrusive solution I think.
Once installed, the sliding glass door butts up against the pet door insert so the dogs only go through the pet door. You can add strip insulation where the sliding glass door and pet door meet to reduce air from escaping.
How to Install a Dog Door for a Large Dog | This Old House