In my area they have also started microchipping shelter cats. Both Sky and Cirrus were already chipped. Sky came from a shelter and Cirrus was from a rescue organization. After I adopted Sunny, I had him chipped at the vet's office. Storm also came from the shelter but has never been chipped but that was almost 7 years ago. I keep forgetting to do it. They're also indoor only cats so hopefully they'll never get out or get lost.