Sorry Gary, but the assumption is wrong. The patio/deck doors are true French doors with French screens. I detest sliders and the old door was a patio door. You know, the single door with the big window. Hated it too. On beautiful spring and fall days we love to open the house and those French doors let lots of breeze in. Plus going in and out with a handful of meat destined for the smoker or the grill is so much easier this way.@gryphonslair99: Gary suspects the lack of suitable dog door space is due to sliding glass door(s). Under that assumption, they do make glass panels with built-in dog doors that just slip into the rails of the existing glass sliders. It takes about a minute to install.
Also we have to have an electronic dog door as the cat is an inside cat only and they take up too much room to put under a window.