Moving house, going abroad, allergies, etc. There are many situations that can cause a cat to change owners in its lifetime. And then, inevitably, after several years of companionship, it dies. These are all events of which CatID should be notified.
Electronic registration makes it easy to manage this type of information. Simply ask your vet, who can make the necessary adjustments to the record, or log onto the online application yourself for access to the functionality that lets you send notification of your lost pet.