I am building indoor/outdoor dog runs. The problem I have is that the concrete pad outside is 2 1/2 - 3 inches lower than the indoor floor. I have a dog that is 25 inches tall at the shoulders and another dog that is only 6 inches off the ground at her chest. If I put the top of the door at 26 inches from the inside floor, the bottom is 9 inches above the outside concrete pad. and about 6 inches off the inside floor. There is a 10 inche wide concrete wall to cross between the inside and outside. It is about 3 inches off the inside floor and 5 - 6 inches off the outside pad. I need suggestions on where to position the dog door.