Wait, are you counting on the closed cat door to keep the other critters out?
In my experience that is not a long term successful strategy but it did lead to much amusement in my life… I have a cat door on my tack room/grain storage area, but no barn cats because that would just be donating them to the coyote meal plan. The insert to block the door had long vanished so door had a generous amount of gorilla tape closing it off from wildlife. Like most horse people I also had a giant tub o’peppermints on a shelf over the feed cans along with the supplements. The good kind of peppermints, basically a lump of sugar. One morning I come in and strewn across the feed can lids is about 30 empty peppermint wrappers along with the tub, no longer on the shelf, but set down on the feed can. There was also the most glorious sticky mess of sugary peppermint EVERYWHERE…
Yes, I was visited by the PEPPERMINT BANDIT!!! 


I checked the cat door and sure enough, the tape had come loose, and obviously the world’s happiest raccoon had made his way in for THE BEST NIGHT EVER. While he did make my day, I repaired both the inside and outside of the door and added some reinforcement in between.