We have the same kind of door, but they make dog doors here that are designed to be installed in glass, so it's not a problem. They're actually cheaper than the kind they put through drywall too, so it would save us money if we do it that way. I just want to wait until Sadie knows how to ask to go outside because we travel a lot and most of the places we visit don't have dog doors, so she needs to know how to get outside without one.