Thanks for the reply. I ended up getting a PetSafe XL door, it's got a very large opening and was only $95 on ebay. I just got done making my back porch handicap accessible for Pasta. I had to put up a large ramp to replace the steps, put wire all around the porch so she wouldn't accidentally fall off, and another small ramp to the house. The large ramp was a bit slippery so I put a heavy coat of paint, dumped sand on it, and put another coat of thick paint to make a really nice, cheap, slip proof surface. Pasta doesn't quite understand ramps but is making progress and is already using the dog door by herself. Now she can get in and out of the house whenever she wants during the day.