A microchip is not the same as a microchip registration
A pet microchip is a passive RFID transponder about the size of a grain of rice. It has no battery and no GPS. It stores exactly one thing: a number.
When a vet or shelter scans a chip, the scanner returns that number and nothing else — no name, no phone number, no address. The number only helps your pet get home if it is linked to current contact information in a registry. Without that link, a scan ends at a string of digits.
Implanting and registering are two separate events. A vet or shelter implanting a chip does not automatically create a registration in your name. And adopted, rescued, or rehomed pets very often carry a chip still registered to a breeder, a shelter, or a previous owner — or one that was never registered at all.
If the lookup above shows no active registration for your pet's number, you can register the microchip in a few minutes and link it to contact details that actually reach you.
Why unregistered microchips fail
In a study of more than 7,700 stray animals entering US shelters, microchipped dogs were returned to their owners 52.2% of the time, versus 21.9% for dogs without a chip. For cats the gap was wider still: 38.5% versus 1.8%. (Lord et al., Journal of the American Veterinary Medical Association, 2009;235:160–167)
The leading reason microchipped animals in that study were not reunited with their owners was missing or incorrect owner contact information — a chip that was implanted but never properly registered, or a registration with a phone number that no longer worked.
The takeaway is plain: a chip roughly doubles a dog's odds of coming home — but only when the registration behind it is real and current.
How to read your microchip number
Microchip numbers come in three formats:
- 15 digits — the ISO 11784/11785 international standard, used by most chips implanted in the US today.
- 10 characters — an older alphanumeric format that may include letters.
- 9 digits — an older US format.
Enter digits only. Strip spaces, dashes, periods, and any manufacturer name or type code printed on the paperwork. Numbers starting with 900are shared across multiple manufacturers, so the prefix alone doesn't identify the chip brand.
Don't have the number? Check your adoption or vet paperwork, the chip registration certificate, or the sticker in your pet's medical file — or ask any vet clinic or shelter to scan your pet. Most will scan for free.
What 24/7 Paw Watch registration includes
Registration links your pet's chip number to you — so a scan at a clinic or shelter turns into a phone call home. Every plan includes:
- A secure registration record for your pet's chip number, searchable 24/7 — active immediately after checkout
- A pet profile with your contact details, plus unlimited updates whenever you move or change your number
- Lost pet recovery assistance and a listing in our Lost & Found network if your pet ever goes missing
- A 24/7 lost pet hotline, so a finder can reach a person at any hour
Most owners choose Lifetime protection at $129.99— one payment, no renewals, covered for your pet's whole life. Annual protection is $49.99 per year. Full details are on the pricing page, and you can read more about who we are on our about page.
Part of the AAHA Universal Pet Microchip Lookup network
24/7 Paw Watch is a participating registry in the AAHA Universal Pet Microchip Lookup, the search tool veterinarians and shelters use to identify which participating registries hold a record for a chip number. When your pet's chip is registered with us, a professional running that search sees that an active registration exists — and how recently it was updated — so they know to contact us to reach you. The lookup tool on this page checks the 24/7 Paw Watch registry itself.
Frequently asked questions
How do I check if my pet's microchip is registered?
Enter the microchip number in the lookup tool at the top of this page. It accepts 9, 10, and 15-digit numbers and checks them against the 24/7 Paw Watch registry in seconds — free, with no account needed. If no active registration comes up, you can register the same number in minutes without retyping it. If you don't know the number, any vet clinic or shelter can scan your pet.
Is a microchip lookup free?
Yes. This lookup is free and does not require an account. Entering a number never creates a charge — registration is a separate, optional step. Vet clinics and animal shelters will also scan a pet's chip for free, which is the fastest way to get the number if you don't have the paperwork.
My pet is microchipped — why isn't the number coming up?
A chip that was implanted is not automatically registered. The number may never have been linked to your contact information, the registration may have been started but never completed, or there may be a typo — chip numbers are long and easy to mistype, so re-enter it carefully. If the number still shows no active 24/7 Paw Watch registration, you can register it now and link it to your current contact details.
I found a dog with a microchip. What should I do?
Take the dog to any vet clinic or animal shelter. They will scan the chip and run the professional lookup tools available to them at no charge to you. Also notify local animal control and nearby shelters — owners often call them first — and post in local lost-pet groups with a photo and the area where you found the dog.
Does a microchip track my pet's location?
No. A microchip is not a GPS device. It is a passive RFID transponder with no battery and no signal of its own. It stores one identification number, which a handheld scanner can read from a few inches away. Recovery still depends on a person finding your pet, scanning the chip, and reaching you through a current registration.
Do I need to re-register if I move or change my phone number?
You don't need a new registration — you need to update the one you have. A registration with a disconnected phone number or an old address fails exactly when it matters most. 24/7 Paw Watch registrations include unlimited contact updates, so you can sign in and change your details in minutes whenever your information changes.
I adopted a pet that already has a chip. Is it registered to me?
Usually not. Implanting and registering are separate steps, and adopted or rehomed pets often carry a chip still registered to a breeder, shelter, or previous owner — or to no one at all. Run the number through the lookup above, then register it in your own name so a scan leads back to you, not to someone who can no longer help.
Can one microchip be registered in more than one place?
Yes. A registration is a database record about a chip number, not a change to the chip itself, so the same number can be on file in more than one database. What matters is that at least one registration carries current, reachable contact information. Whatever else you keep active, make sure the details behind your pet's number are up to date.
How much does it cost to register a microchip with 24/7 Paw Watch?
Registration is $49.99 per year, or a one-time $129.99 for lifetime protection with no renewals. Both plans include your searchable registration record, unlimited contact updates, lost pet recovery assistance, and the 24/7 lost pet hotline. Looking up a number is always free.
What do the 9, 10, and 15-digit microchip formats mean?
They reflect when and where the chip was made. Fifteen-digit numbers follow the ISO 11784/11785 international standard used by most chips implanted in the US today. Ten-character numbers are an older format that can include letters, and nine-digit numbers are an older US format. All three are valid — the format tells you the chip’s era, not whether it is registered.