My DH makes screen frames for the doors, the width of the door and about 4 feet tall, think of a 1/2 screen door that just pops into the inside of the door, the cats cannot jump over them. This allows heat and ac to flow through the rooms and if you ever want to know where anyone (cat or dog) is...look just outside the screen. They are always there looking at me whether I am sewing, quilting or doing Yoga. LOL