I recently moved into a new house and found a convenient location for my cat's litter box in the basement. Then, I thought I would be nice and put a cat-door in the basement door for her. She just doesn't get it. I shove her through, but she can't figure it out herself. She just sits there and glares at me through the plastic window. She's an older cat (14 yrs or so). So, I don't know if she just stubborn or what.