So the deer came in one minute earlier, and they showed the cat first to prove the nature of the door? The cat was following the deer? Or was their camera clock counting down to something?
I thought it was a small dog at first, like a chihuahua or whatever, but then it stood up and I was all AWW THAT'S WAY CUTER. HEY LITTLE FELLA WHAT ARE YOU DOING IN HERE?
(don't they make some kind of RFID-type pet doors now that only open when a creature with the appropriate collar tries to go through?)