Dog Microchipping: How It Works, Cost & Registration

Dog microchips use radio-frequency identification, or RFID. When a scanner passes over the chip, it activates the device and displays the chip's unique ID number. The chip itself does not contain your dog's medical record, home address, or live tracking data.

After the number is read, staff contact the registry tied to that chip number to reach the pet parent. Depending on the company, the chip number may be 9, 10, or 15 digits. The 15-digit format is the international ISO standard and can be especially important for dogs who may travel internationally.

Microchip placement is usually quick and is often compared to receiving a vaccine, though the needle is a bit larger. Many dogs tolerate it well while awake during a regular appointment. Some puppies are chipped during early preventive care, and many dogs are chipped while already under anesthesia for spay, neuter, or another procedure.

Placement should be done by your vet or under veterinary supervision. After placement, ask your vet to scan the chip before you leave so you can confirm the number and registry paperwork.

A microchip that is never registered may not help much if your dog is lost. The scanner only reveals the chip number. Shelter or clinic staff still need a registry with your current phone number and contact details to reconnect you.

Update the registry any time you move, change phone numbers, add an emergency contact, or transfer the dog to a new pet parent. If you are not sure which company manages your dog's chip, the AAHA Universal Pet Microchip Lookup tool can help identify the likely registry linked to that number.

For many dogs, the chip implantation itself runs about $15 to $50 in the United States. Some practices bundle microchipping into puppy visits, adoption packages, or spay/neuter services. Others charge separately for the chip, office visit, and registration support.

Registration costs vary by company. Some registries include basic enrollment with the chip, while others charge a one-time enrollment fee or offer optional paid recovery services. For example, AKC Reunite lists online lifetime enrollment at $17.50 and paper enrollment at $19.95. Ask for the full cost range up front so you know whether the quote includes implantation, registration, and any optional services.

Microchips can improve the odds of reunion when a lost dog is found and scanned. AVMA-cited data show that lost dogs entering shelters were returned to their families more often when microchipped than when not microchipped.

Still, microchips are not fail-safe. They are not GPS devices, they depend on someone scanning the dog, and chips can occasionally migrate or become difficult to read. That is why AAHA recommends annual scanning and continued use of a collar with visible ID tags.

Most microchips are designed to last for your dog's lifetime and do not need batteries. During routine wellness visits, you can ask your vet to scan the chip to confirm it still reads and appears to be in a typical location.

If a chip cannot be read, has migrated, or was never properly registered, your vet can talk through options. In some cases, a second chip may be placed rather than removing the original. Removal is uncommon and usually only considered for a medical reason.

Keep your dog's microchip number in your phone, adoption records, and emergency kit. Confirm the registry name, website, and customer service number. Add at least two phone numbers and an alternate contact who could answer if you are unreachable.

If your dog goes missing, contact local shelters, animal control, rescue groups, and nearby veterinary hospitals right away. Microchipping helps, but fast local outreach and visible ID tags still matter.