I realize this is a stale thread...but I just rescued a mouse identical to the one which started this thread. One of my cats carried it in to the yard, and his little squeaks got my attention right away. He doesn't appear to be hurt, so I'm giving him the grass/rice/oats/water in a box treatment until morning. He's young, but has fur, etc. I wish I knew where kitty found him, because I'd put him right back there with his mates.
Yes, rodents carry fleas which carry disease. I still can't stand it when the cats bring me live things. If they want to kill to eat, great, just don't do it around me. I don't mind cleaning up/burying rat heads and mouse guts, but I WILL rescue the terrified little things. I usually set them loose under the blackberry bushes (a la Brer Rabbit) do they can lose themselves in the "briar patch". If they're going to die, I'd like it to be a quick kill. If the cat is going to just play with his food, I take it away so the critter can die in peace or at least be eaten by something more businesslike, like a hawk.
Cheers,
Neb