Microchip Selector Guide

Pet microchips provide identification for pets in case they get lost or stolen. Unlike tags or collars that can be removed, microchips provide permanent computerized identification that is embedded under a pet's skin. There are several types of microchips available, so it is important to understand the differences.

  1. Function

    • Microchips are transponders that will emit a radio signal when a scanner is passed over them. The scanner picks up the ID code and the veterinarian or person reading it must then call a registry to obtain the pet owner's information.

    Size

    • Pet microchips are small chips that are a little bigger than a grain of rice. A veterinarian implants the microchip in a pet using a special needle that injects the microchip in the injection site.

    Frequency

    • There are three standard frequencies for microchips available: 125kHz, 128kHz and 134kHz chips. Most chips in United States animals are 125kHz; however, the rest of the world uses 134kHz chips, which is an ISO standard (a standard set forth by the International Organization for Standards). The only advantage choosing a 134kHz chip is if you plan to take your pet outside of the United States; however, there is the potential for shelters with older readers to not recognize chips with 128kHz and 134kHz frequencies.

    Brands

    • Many companies offer microchips for pets, such as AVID, HomeAgain and AKCCAR, most which are 125kHz. However, the company DATAMARS has manufactured the Crystal Tag chip, which is 134kHz, implanted by Banfield Veterinary Hospitals in the United States.

    Warning

    • Although there are now universal scanners that identify all chips, there have been problems in the past with shelters unable to read chips of frequencies other than 125kHz in the United States. Always register your pet with the microchip registry and keep your contact information current. Don't implant more than one chip as they can interfere with each other and give incorrect readings.

    Standardization

    • The problem the United States faces is that most microchips are read using the 125kHz frequency and not the international standard. Chip manufacturers have developed and distributed chip readers that read all accepted frequencies, but there is no one standard in the U.S. Ask your veterinarian which frequency is best for your pet; most veterinarians know the issues associated with microchips and will be able to tell you which is the most readable chip for your situation.