Dog Microchip Complete Guide — Mandatory Law, Implantation & Registration

Japan's Mandatory Microchipping Law

In June 2022, Japan enacted landmark legislation requiring all dogs and cats sold by licensed breeders and pet shops to be microchipped before sale. This mandate, part of the revised Act on Welfare and Management of Animals, represents one of the most significant shifts in Japanese pet ownership policy in decades. Animals born before June 2022 are not retroactively required to be chipped, but existing owners are strongly encouraged to comply voluntarily. For any dog purchased through a registered breeder or pet retailer after the law's effective date, a microchip is not optional — it is a legal requirement that must be in place prior to the animal leaving the breeder's facility.

What Is a Microchip and How Does It Work

A microchip is a passive radio-frequency identification (RFID) transponder roughly the size of a grain of rice — typically 2mm in diameter and 12mm in length. "Passive" means the chip carries no battery and produces no signal on its own. Instead, it activates only when a compatible scanner passes over it, emitting a unique 15-digit identification number that conforms to the ISO 11784/11785 international standard. This number is permanently encoded at the time of manufacture and cannot be altered or duplicated.

The chip is encased in biocompatible glass designed to integrate safely with surrounding tissue. Once implanted, it remains in place for the dog's entire life. There is no maintenance, no charging, and no expiration. The chip itself does nothing more than store that single unique number — it is not a GPS device and cannot transmit location data. Think of it as a permanent, tamper-proof ID tag embedded beneath the skin.

The Implantation Procedure

Microchip implantation is performed exclusively by licensed veterinarians in Japan. The procedure is straightforward and typically takes under thirty seconds. The chip is pre-loaded into a sterile syringe with a slightly larger gauge needle than a standard vaccine injection. The veterinarian parts the fur between the dog's shoulder blades, lifts the skin, and injects the chip into the subcutaneous tissue in a single smooth motion.

Most dogs tolerate the procedure with minimal reaction — comparable to a routine vaccination. Sedation is not required for the vast majority of animals. Some owners report a brief flinch or yelp, but discomfort is short-lived. Following implantation, the veterinarian will scan the chip immediately to confirm it is reading correctly and that the displayed number matches the documentation. Breeders subject to the 2022 mandate typically have chips implanted while puppies are still in their care, well before the animals are transferred to new owners.