1.  A study of more than 7,700 stray animals at animal shelters showed that dogs without microchips were returned to their owners 21.9% of the time, whereas microchipped dogs were returned to their owners 52.2% of the time.

2. Cats without microchips were reunited with their owners only 1.8% of the time, whereas microchipped cats went back home 38.5% of the time. (Lord et al, JAVMA, July 15, 2009)

3. Over 200,000 microchip scanners have been placed with animal care givers across the United States.  Nearly all found dogs get scanned for a microchip.

4. For microchipped animals that weren’t returned to their owners, most of the time it was due to incorrect owner information (or no owner information) in the microchip registry database.

Moral of these stories:  Register the microchip and keep owner information updated!