Here is my first attempt at posting a video:
This is Keeper opening our patio door.
Breathtaking video, isn't it? :-)
He learned this trick from his mother Kinsey (or possibly he learned it the same way she did, from watching us open it). But whereas Kinsey gently noses it just far enough open to let her through, Keeper opens it much faster and he usually gives the door a giant push that opens it about halfway. The only reason he's more cautious here is that I'm standing right there, telling him not to come out!