What is the ISO 11784/11785 microchip standard?
ISO 11784/11785 is the international standard for pet microchips that defines their operating frequency, data format, and how they transmit identification information to scanners.
The ISO 11784/11785 standard governs microchip technology used for permanent pet identification. It specifies operating frequency, data encoding, and scanner compatibility to ensure a microchip implanted by one veterinarian can be read by scanners at any animal shelter or recovery facility. Most microchips sold in the United States operate at 134.2 kHz and comply with these standards, though some older or imported chips may use 125 kHz, creating compatibility gaps with certain scanners.
When a microchip is implanted, the unique identification number stored on it must be registered with a national pet recovery database. This registration links the chip's ID to the owner's contact details. If a lost pet is found and brought to a veterinary clinic, a compatible scanner reads the chip and retrieves the database entry, allowing the owner to be contacted. Without registration, the microchip alone cannot reunite a pet with its owner.
Denver-area veterinarians typically implant ISO-compliant microchips as a routine procedure. The standard ensures that a pet microchipped in Denver can be identified at shelters, emergency clinics, or recovery services across Colorado and nationwide. Owners should verify that their veterinarian registers the chip immediately after implantation and maintain current contact information in the recovery database.