How to Register a Pet Microchip: The Complete 3-Step Guide

October 6, 2026

You may already know your dog's or cat's microchip number. Perhaps it is printed on adoption paperwork, buried in an old veterinary record, or saved in your phone. But there is an important question many pet owners never ask: What happens when someone scans that number?

A microchip is not a GPS tracker, and it does not automatically transmit your name, address, or phone number. It is a passive RFID identification device containing a unique ID number. The reunion process depends on what that number connects to in a pet recovery registry. AAHA specifically advises pet owners to register their chips and keep their contact information current.

The good news is that checking this connection is straightforward. Once you understand the system, you can verify your pet's registration, correct outdated information, and close one of the most commonly overlooked gaps in lost-pet preparedness.

Quick Answer
Key Takeaways
What a Pet Microchip Actually Does
How to Register a Pet Microchip in 3 Steps
Common Microchip Registration Traps
What Most Pet Owners Overlook
Where a Home Microchip Scanner Fits In
Keep the Microchip in a Larger Identification System
Frequently Asked Questions
Conclusion
External References

Quick Answer

To register a pet microchip, first find your pet's microchip ID number, then use the AAHA Universal Pet Microchip Lookup Tool to identify participating registries associated with that number. Contact the appropriate registry to register the chip or update your details. Keep your phone number, email, address, and alternate contact information current.

Key Takeaways

A microchip stores an identification number, not your contact information.
Modern ISO-compatible pet chips commonly use a 15-digit identification number, but some U.S. chips use 9- or 10-digit numbers.
The AAHA lookup tool helps identify the registry associated with a chip.
AAHA's lookup tool does not register or update your pet for you.
Where the registry allows it, provide multiple current ways to contact you, including a reliable secondary contact.
A microchip should complement, not replace, a visible ID tag.

What a Pet Microchip Actually Does

Think of the microchip as an identification key, not a tracking device.

A typical pet microchip is a tiny passive RFID transponder implanted beneath the skin. When a compatible scanner passes over it, the scanner activates the chip's transponder and reads its identification number. The chip itself does not contain your home address or phone number, and it does not track your pet's location.

The recovery chain is therefore:

Microchip → identification number → registry record → current owner contact information

If that number is not connected to current registry information, a successful scan may still leave a shelter, veterinarian, or animal control professional without a reliable way to reach you.

One important nuance: not every pet chip has 15 digits. AAHA recognizes 9-, 10-, and 15-digit identifiers, while 15-digit ISO microchips are the international standard for animal identification.

How to Register a Pet Microchip in 3 Steps

Step 1: Find and Verify the Microchip Number

Look through your pet's:

Veterinary records
Adoption or breeder paperwork
Microchip documentation
Previous medical records

Can't find the number?

Ask your veterinarian or animal shelter to scan your pet. A successful scan should produce the chip's identification number. AAHA recommends periodic scanning to verify that the chip remains detectable and in the expected location.

This is also where scanner compatibility matters.

A failed scan does not automatically mean your pet has no chip. Different chip technologies and frequencies exist, particularly in the United States. Positioning, chip migration, scanner compatibility, and scanning technique can all affect the result.

For a practical walkthrough, see our guide on how to get an accurate microchip scan every time.

Step 2: Use the AAHA Microchip Lookup Tool

Once you have the number, enter it into the AAHA Universal Pet Microchip Lookup Tool.

This is an important distinction: AAHA is not the registry where you normally update your owner's details.

The lookup tool searches participating pet recovery services and identifies registries that may have information associated with the chip. It does not display the owner's private information and does not let you directly edit your pet's record.

Depending on the chip, you may see one registry or several possible registries. AAHA advises starting with the first company listed, which reflects the most recent available registry information, and working through the listed registries when necessary.

Step 3: Complete or Update the Registry Record

Now contact the relevant registry and make sure the microchip is connected to you, not simply to a manufacturer, shelter, breeder, previous owner, or outdated phone number.

Depending on the registry, verify the details it allows you to maintain, including:

Your full name
Primary phone number
Secondary phone number
Email address
Current address
A trusted alternate contact

Some registries also allow additional pet information, veterinary details, or medical notes. AAHA's guidance specifically recommends providing multiple ways to contact you and keeping those details current.

The precise registration process and fees can vary between registries, so check the current terms of the registry identified for your pet rather than assuming every service works the same way.

Common Microchip Registration Traps

What Most Pet Owners Overlook

The weak point is often not the chip itself. It is old information.

A phone number from three years ago is still attached to the same microchip unless someone updates the registry. The same applies after moving, changing email addresses, changing ownership, or losing access to an old phone number.

AAHA specifically encourages pet owners to keep contact information current, while the ASPCA recommends microchipping alongside collars and current identification tags.

A useful habit is to treat microchip information like an important account rather than a one-time form.

Review it whenever you:

Move to a new address
Change your main phone number
Change email addresses
Adopt a pet with an existing chip
Transfer ownership
Discover that a registry has closed or changed

The importance of this last point became particularly clear after Save This Life ceased operations, prompting AAHA to advise affected pet owners to re-register certain chips with another registry.

Where a Home Microchip Scanner Fits In

A scanner can help you verify that the identification number is available, but it does not replace registration.

The LuxePets Eco Handheld RFID Microchip Scanner is designed to read FDX-B ISO 11784/11785 chips at 134.2 kHz and EMID chips at 125 kHz. It can store up to 500 scan records and offers USB connectivity, with Bluetooth available on the Bluetooth variant.

There is an important limitation: this scanner does not currently read 128 kHz chips. That makes specification matching essential, especially for professional or high-volume use.

For a deeper explanation of why one reader cannot automatically detect every chip, see Why Not All Microchip Scanners Are Universal.

For most pet owners, the practical goal is simple: know the number, know the registry, and know that the contact information is current.

Keep the Microchip in a Larger Identification System

A registered microchip is valuable, but it should not be your pet's only identification method.

AAHA recommends combining permanent identification with current collar tags, and the ASPCA similarly supports microchips alongside visible identification. A finder can read a tag immediately, while a microchip provides identification if the collar is lost.

That layered approach is especially useful for pets who travel, spend time outdoors, escape unexpectedly, or are transported during emergencies.

Our guide, If Your Pet Ever Goes Missing: A Prevention and Recovery Checklist, walks through the broader preparation process.

Frequently Asked Questions

How do I register my pet's microchip?

Find the chip's identification number, use the AAHA Universal Pet Microchip Lookup Tool to identify the relevant participating registry, then contact that registry to complete or update the registration.

How do I check whether my pet's microchip is registered?

Enter the microchip number into the AAHA lookup tool. It can identify participating registries associated with the number, but it does not directly display your owner's details. Contact the registry to confirm your registration status.

What information is stored on a pet microchip?

The microchip itself stores an identification number. Your name, phone number, address, and other information are maintained separately by the relevant registry.

Can I update my pet's microchip phone number?

Yes. Contact the registry associated with your pet's microchip and update your contact information whenever it changes. AAHA specifically recommends keeping these details current.

Is a microchip a GPS tracker?

No. A pet microchip is a passive identification device. It cannot show your pet's location in real time.

Conclusion

Microchipping your pet is only the beginning of the identification process.

The number printed in your records is important, but its practical value depends on what that number connects to when someone scans your pet. A registered chip, current contact information, a reliable alternate contact, and a visible ID tag create a much more complete identification system.

Take a few minutes to find your pet's chip number, run the AAHA lookup, and verify the registry record. You do not need complicated technology to make the system work better. You simply need to close the gap between the number on the chip and the person who can be reached when it matters.