All pets, even strictly indoor cats, should have microchips and ideally collars and ID tags. What happens if your pet sneaks out an open door or window, or worse yet, gets lost during an earthquake, hurricane or tornado? Collars and tags allow a neighbor to return your pet directly to you, but unfortunately, collars can break or fall off. Microchips provide a more reliable means of identification. Of course, for them to work, make sure you register and keep your contact information up-to-date. The fact is accidents happen and it is always better to be safe than sorry. Making sure that your pet has proper identification (collar, tag and microchips) will improve the odds that your pet will be returned home if they ever get lost.
Remember for information or questions about your pets and their healthcare speak to your veterinarian. They are a great resource and know your pet best!