If you have a dog door for your greys, can you share the dimensions (width/height/rise) and brand you have? I searched the archives and am thoroughly confused.... On the Pet Door Guys site, it says the top edge should be at least 1 inch taller than the dog's shoulder, but that means my dog needs an opening that is 30" high and I can't seem to find one for my sliding glass door at that height. What do you all have, other than shorter hounds?