The American Veterinary Medical Association recommends a Certified ISO microchip for all species.
From AVMA.org:  “The American Veterinary Medical Association (AVMA), American Animal Hospital Association (AAHA), World Small Animal Veterinary Medical Association (WSAVA), and American Society for the Prevention of Cruelty to Animals (ASPCA) endorse the use of electronic identification in animals and support the implementation of ISO standard 11784/11785 in the U.S.” Read entire article here.