So long story short, my cat caught a small mouse tonight and when I found it, I picked it up by the tail to throw it out thinking it was dead. Thing is, it very much wasn't. It is pretty active and alive, but its back legs (definitely one, not sure on the other) aren't working. I know these things can carry some pretty nasty stuff, so I havent handled it since putting it in a spare tank with some aspen bedding, a little water, some apple pieces, and an old sock (this was very short-notice, obviously). I have purelled the daylight out of my hands as well.
I would just let it outside and let nature take its course, but it's freezing outside and I know thats a death sentence. Obviously I don't want to re-release it into my kitchen either. I'm searching for wildlife rescues but I'm not sure any have interest in a house mouse. Despite seeming active, I know his back legs are bad. Is there anything I can do to help the little guy? And if not, how can I humanely euthanize him? I don't get paid till friday and I didn't really budget myself for a spontaneous vet mouse-euthanasia visit.