Mouse in the House

The other day, we heard a screeching, and then our plumpest cat came running through the living room with her mouth full and a tail hanging out. :/ We managed to get her to release the mouse, and I thought it was dead, but then I saw it breathe! So after observing it for a little while, we thought it looked okay because it could run around in a garbage can, so we released it outside. We saw the ground cover move so it must have run off. Poor thing. It was just a baby Peromyscus (white footed mouse). I had done a science project once on homing in white footed mice, and no matter how far away I released the mice I caught, they would always come back and get caught in the live traps again. (We would snip their fur to be able to recognize them). This one mouse I had caught several times, except one cold night it had gotten into the trap even though I would close the traps over night, and we thought it had frozen to death. My mother gave it CPR (well, she rubbed its chest) and I saw it breathe! So we kept it in a cage for a week, and then released it. "Frozen Boy" kept getting caught in the traps after that and I can't remember if I continued to transport him and release him, or if I decided to retire him from the experiment.