INDOOR ONLY
why?

cars
bad people
wildlife with rabies
strays with FIP, FeLV, FIV and other transmittable diseases
pesticides on peoples lawns
antifreeze and other automotive products
tick, fleas and other parasites with the possibility of even more disease
dogs
extremes in temperature
skunks
pollution (could get into poisons in people's garbage)
getting injured and not being able to make it home

need I go on?