I thought about it and decided to not get my Puppy Shih Tzu microchipped. He is never out of my sight. We have a small fenced yard inside of a large fenced yard. I always go outside with both dogs, they can't get out of the small yard.
My Daughter had a dog given to her that had been microchipped by three owners before. No one ever checked to see if she had a microchip.
Chances are if someone stole a dog they would not take it to a Vet. My Vet always scans dogs and cats, even puppies and kitties, not all do.