The ASPCA strongly recommends that pet owners consider microchipping their pets, in addition to a current dog license and identification tag. You may also wish to discuss microchipping with your local veterinarian.
The following companies provide microchipping services. You may wish to visit their websites:
American Veterinary ID Devices (AVID)
(800) 336-AVID
http://www.avidid.com/
IDENTICHIP:
(800) 926-1313
http://www.identichip.com/
Home Again
(866) 738-4324
http://www.public.homeagain.com/
Companion Animal Recovery
(800) 252-7894
http://www.akccar.org/