The following information are excerpts from an article provided by the Cat Fanciers' Association
Your Cat is Safer Indoors
One big advantage of a pet cat over a dog is the fact that cats naturally use their litter tray and therefore there is no need to turn them out. In fact, if you really love your cat and value him, you will never let him out of doors unless he is with you in a carrier. Unattended, the odds are that your cat will be run over, poisoned, shot or stolen. There is also a danger of your pet picking up a disease, such as rabies, thus endangering the lives of your family. Fleas, ear mites, fungus skin disease, and intestinal parasites may be contracted from other cats and animals. By fighting with other cats, he may develop abscesses due to bites. When your cat is kept indoors, no one can complain about him. In order to avoid in any way creating a dislike for our pets, we must not let them disturb other people, nor allow them to roam on their premises. A cat which has never been outdoors will have no desire to go out.
Keep him in clean quarters, properly fed, and above all , loved. A clean litter pan and fresh water should always be supplied and changed daily. Each cat at birth is one of God's creatures and deserves to be kept clean, in pleasant surroundings, well fed and loved. No animals should be treated as a "thing" by letting children mishandle him as if he were a toy.
More of this article can be read HERE.