I've known the horror of having to take a terrified, fatially injured, crying/screaming in pain and suffering pet, on it's final ride to the vets, after it had been hit by a car. I've known the pain of letting a pet outside...and never seeing it again. I've known the horror of having a pet come home--after days of being lost, with a broken leg. I've learned my lesson the hard way, over the decades.

Learn your lesson the easy way: Read this, and then keep your pet indoors--if you love it, don't let it die horribly, for no other reason than you were too lazy to change a cat's litter box, or walk your dog on a leash.

http://home.hiwaay.net/~keiper/indoors.htm