A pet microchip is a tiny radio-frequency identification (RFID) device, about the size of a grain of rice, implanted under the skin between the shoulder blades. Each chip carries a unique identification number linked to owner contact information in a registry. Microchipping is a permanent form of identification that cannot be removed, altered, or lost like a collar and tag.
The implantation procedure is quick (similar to a vaccination injection), typically requires no anaesthesia, and takes only seconds. The chip is inserted using a large-gauge needle and causes minimal discomfort. Unlike GPS trackers, microchips are passive devices — they have no battery and emit no signal. They are read only when a scanner is passed over them at a vet clinic, shelter, or by animal control.
The critical step that many pet owners miss: implanting the chip is only half the process. The chip's unique number must be registered with an owner's current contact information in a searchable database. An unregistered microchip cannot help reunite a lost pet with its owner. Registration must also be updated if you move or change phone numbers. Multiple competing registries exist — consider registering with a universal lookup site like PetMicrochipLookup.org.
Microchipping is legally required for dogs in several countries including the UK, Australia, and many EU nations. In the United States, it is not federally mandated but is strongly recommended and required by many municipalities and airlines. Most vets and shelters routinely scan every animal that comes through their doors for a chip.
📌 Key Facts
Size: About the size of a grain of rice
Implant location: Under the skin between the shoulder blades
Battery required? No — passive RFID, activated only by scanner
CRITICAL: Chip must be registered and contact info kept current
Frequently Asked Questions about Microchip (Pet Microchipping)
Q: Can a microchip tell me where my pet is right now?
No. A microchip is not a GPS tracker — it cannot broadcast a signal or show a location. It can only be read by a scanner when your pet is physically present at a vet, shelter, or animal control facility. GPS pet trackers (worn on the collar) serve a different function.
Q: My pet has a microchip — does it need a collar and tag too?
Yes. A collar and ID tag provide immediate identification visible to anyone who finds your pet. A microchip requires a scanner and a registry lookup. Use both — collars can come off, but chips are permanent. Together they provide the best chance of reunion.
Q: Can a microchip migrate under the skin?
Occasionally yes — chips can move from the original implant site, usually down the leg or toward the chest. This is why scanners are passed over a wide area of the body, not just between the shoulder blades. If you're unsure your pet's chip is still detectable, ask your vet to scan it at the next check-up.
⚠ Medical Disclaimer: This glossary entry is for educational purposes only
and does not constitute veterinary advice. Always consult a licensed veterinarian for diagnosis
and treatment of your pet's health conditions.