If it is feeling trapped, you might have better luck getting kitty to go away than the possum. Even if you have to spray the cat, it could be much better for her than letting it play out. Once the cat is gone, the possum will realize it's safe to leave, hopefully. Kitty will forgive you, I'm sure.I've tried dousing it in water but it just keeps hissing at me. I can't think of anything else in the house to throw it's way and I think that if I scare it enough, it might attack the cat or something. I do have a way to get rid of it.. but it's not legal and I'd rather not hurt it unless it does something aside from getting into the trash. I'm so conflicted lol.