HELP! I lost MY PET FERRET!

Someone left the garasi door open at night and we suddenly can't find our penyelidik, ferret and we know it's sure because my dad berkata he's sure that he felt someone furry beside his feet. I'm so worried cause my mom berkata it's gonna rain tonight and we can't go further cause it's dark.
Does anyone know what I should do? He's gonna be so cold and I hope he doesn't get far and die.