Cats are finicky animals. They don’t like to change their habits! So when you are supposed to install a new cat door you know it’s not going to be an easy task. You can work hard all day long, and the puss can decide that she simply doesn’t like what you’ve done and can refuse to use the door, which means that all your hard work goes to waste.
In this video we see a cat about to test her new door. She approaches the opening, and decides that she would rather use the big door, because, after all, she is the boss! Hilarious!