i just found my cat playing with a baby mouse.. i saved it from my cat since she doesnt eat mice now i dont know what to do with it. its to cold to put it outside
If you put it outside, it will either find somewhere else or come back in to your house, it wont die. Or you could keep it.
Give it back to your cat, it will probably die within days anyway. Finders keepers. Mice are bad news.