Here are some companies that provide microchips. The last one is in Australia. If you plan on microchipping your dog you should find out which company is used by most of the shelters and vets in your area. So there are a few to choose from. Right they are technical issues. Thats why I say it is a personal choice. You have to do what is right for you and your little ones.
American Veterinary ID Devices (AVID)
(800) 336-AVID
www.avid.com
IDENTICHIP:
(800) 926-1313
www.identichip.com
Home Again
(800) 926-1313
info@akc.org
Companion Animal Recovery
(800) 252-7894
www.akccar.org
PetNet
(800) 738-6385
www.petnet.ca