My old 14 and counting beagle/whatever hound is developing some problems whereby he needs to go out for a call of nature several times a night so we are thinking about a doggie door in our sliding door to the deck. They make them but looking at what's offered they just won't work right for our old boy if the opening is big enough the rise is too high. Did any of you ever have to make something to go in a sliding door opening and if you did, how did you do it and how did it work?