CharlieGodammit still doesn't have the concept of sliding doors down yet.
The old house had a regular door from the mud porch so it wasn't any problem there, but with our slider here...... well, it's been 3 weeks and he's already blown out one screen door and I've lost count of the times he's just walked right into the sliding glass door, especially right after Miss Lisa has cleaned it, which she does at least once a day to clean off the doggie slobber, nose prints and gopher guts.
I thought about taping a piece of masking tape at eye level for him, but it's just so damned funny to watch him pile up at the door and then back up try it again.
He may be learning though. Yesterday he walked up to the door pawing the air from about 3 feet away until he got through okay.