What microchip registration actually does

Registering a microchip means entering your pet's chip number and your contact information into a database so that if your pet is lost and scanned by a shelter or veterinarian, the scanner can look up your phone number and address. The microchip itself is a tiny implant about the size of a grain of rice that a vet injects under your pet's skin, usually between the shoulder blades. The chip contains only an ID number — it does not track location, does not require batteries, and does not work like GPS.

Without registration, the microchip is useless. A shelter can scan the chip and see the number, but if that number is not in any database linked to your contact information, they have no way to reach you. Many people assume the vet automatically registers the chip when they implant it, but most vets give you a registration form and expect you to complete it yourself.

Key Takeaways

  • The microchip itself does nothing without registration — you must enter the chip number and your contact details into a database yourself.
  • Most veterinarians provide a registration form at the time of implant but do not submit it for you.
  • You can register through the chip manufacturer's database, through a third-party registry, or through both for extra coverage.
  • Update your registration when ready if you move, change your phone number, or change your email address.
  • Registration is usually free or costs under $20 as a one-time fee, though some registries charge annual renewal fees.

Finding out which chip your pet has

Your veterinarian's records will show the microchip brand and number. If you have the paperwork from the implant visit, it should list both. Common brands include HomeAgain, AKC Reunite, 24PetWatch, and Petlink, though there are others. If you have lost the paperwork, call your vet's office and ask them to look up the chip number in their records — they scan every pet at checkups and keep that information on file.

If you adopted your pet from a shelter or rescue and they told you it was already microchipped, ask them which registry it is registered to and whether they have the chip number. Some shelters register chips in their own name first and then transfer ownership to you, while others hand you the registration form blank. Do not assume the shelter registered it just because they said the chip was there.

Registering through the chip manufacturer's database

Each microchip brand maintains its own primary registry. HomeAgain uses the HomeAgain database, AKC Reunite uses the AKC Reunite registry, and so on. Go to the manufacturer's website, find their registration page, and enter your pet's chip number, your name, address, phone number, and email. Most manufacturers ask for your pet's name, species, breed, and color as well. This registration is usually free.

The advantage of registering with the manufacturer is that their database is the one most veterinarians and shelters check first when they scan a chip. If your pet is scanned, the scanner will display the manufacturer's name, and the person scanning will know to check that specific database. Keep your login information so you can update your details later if you move or change your phone number.

Using a third-party registry for backup coverage

Services like PetLink and 24PetWatch maintain independent microchip registries that are not tied to a single chip brand. You can register your pet's chip number with them even if the chip was made by a different company. The benefit is redundancy — if a shelter checks multiple databases, they have more chances of finding your information. Some people register with both the manufacturer's database and a third-party registry.

Third-party registries sometimes offer additional features like lost-pet alerts, social media posting, or reward coordination, though these vary by service. Some charge a one-time registration fee of $10 to $20, while others are free. Check what each service offers before you register, and read whether they charge annual renewal fees — some do, and some do not.

What information to have ready when you register

Gather the microchip number, your pet's name, your full name, your current address, your phone number, and your email address. Have a backup phone number if possible — a cell phone and a home phone, or a phone number for a family member or friend who can reach you if your primary number is not answered. The more ways a shelter can contact you, the faster your pet comes home.

Some registries ask for your pet's species, breed, color, and age. Others ask whether your pet has any medical conditions or special needs. This information helps a shelter identify your pet if the description is vague, and it alerts them to any medications your pet needs. Be as detailed as you can, especially about distinctive markings or behavior.

Updating your registration when you move or change contact information

Log into your account on the registry website and update your address and phone number as soon as you move. If you change your phone number, update that when ready too. A registration with an old phone number is almost as useless as no registration at all — a shelter will call and reach a stranger, and your pet will not come home.

Check your registration once a year to make sure the information is still correct. If you registered years ago and have moved since then, your old address is still in the database. Some registries send renewal reminders by email, which is a good prompt to log in and verify everything is current. If a registry charges an annual fee and you do not renew, your registration may become inactive.

What happens when a shelter scans your pet's chip

A shelter or veterinarian scans the microchip with a handheld reader that displays the chip number and the manufacturer name. They then contact that manufacturer's database or call a phone number on the scanner to look up your information. If your registration is current and your phone number is correct, they call you. If your information is outdated or missing, they cannot reach you, and your pet goes into the shelter's system as a stray.

Some shelters also check third-party registries if the manufacturer's database does not return a result. This is why registering with multiple services can help — it increases the chance that someone will find your contact information. The entire process from scan to contact usually takes less than an hour if your registration is complete and current.

Frequently Asked Questions

Does the vet automatically register the microchip when they implant it?

No. Most vets give you a registration form to fill out and submit yourself. Some vets offer to submit it for you, but you should confirm they did before you leave the office. If you are unsure, call the vet a few days later and ask them to verify the chip is registered in your name.

Can I register a microchip that was implanted years ago?

Yes. If your pet has a chip but you never registered it, you can register it now using the chip number from your vet's records. Go to the manufacturer's website or a third-party registry and enter the chip number and your current information. The registration will be active when ready.

What if I do not know which brand of microchip my pet has?

Call your veterinarian and ask them to look up the chip number in their records. Once you have the number, you can search it on a universal microchip lookup tool online, or you can register it with a third-party registry that accepts any chip brand. Your vet can also tell you the brand directly.

Do I have to pay to register a microchip?

Most manufacturer registries are free. Some third-party registries charge a one-time fee of $10 to $20, and some charge annual renewal fees. Check the registry's pricing page before you register. Free registration is available through multiple services, so you do not have to pay unless you want additional features.

What if my pet's microchip stops working?

Microchips do not have batteries and do not stop working under normal circumstances. They last the life of your pet. If a scanner cannot read your pet's chip, the chip may be damaged, the scanner may be faulty, or the chip may have moved. Your vet can scan your pet to test whether the chip is readable, and they can implant a new chip if needed.