Tucker's always trying to get out the dog door. He works on this every single day but has not succeeded yet. To help him out I opened the door to see if he would attempt to crawl all the way out. Well, he ended up getting a BIG red scratch on his forehead (yes, I laughed real hard...I know that's bad). Now I leave the door open and he crawls up to the edge but has not tried to crawl down again. He's thinking about it...trying to figure out how to get down without getting hurt.