I have covered the inside cat door; barricaded it, if you will, with a glass shower door I found in the garage.
I sat up very late, and the beast did try to get in, but couldn't. Another beast tried, too. I'm not sure what it was--probably a raccoon.
But...no gore in the laundry room, and my dryer is running much more efficiently.
I don't like to be barricaded into my house, but it's better than having wild beasts come in and tear things up.