Dog Microchipping: How It Works, Costs and Registration

By Tailwisp Editorial TeamUpdated October 17, 20263 min read

Collars can slip off and tags can wear away, but a microchip stays with your dog.

How it works

A microchip is a small glass-encased transponder, about the size of a grain of rice, with a unique number. It has no battery. When a scanner passes over it, the chip transmits the number, which is looked up in a registry to find owner details. Vets, shelters and rescue centers scan found dogs routinely.

Implantation

A vet or trained person injects the chip under the skin between the shoulder blades using a needle slightly larger than a vaccine needle. It takes seconds and usually needs no anesthesia, though some owners have it done during spay or neuter. Puppies can be chipped from about six to eight weeks.

Registration matters

A chip is only useful if the number is linked to your name, phone number and address in a pet recovery database. Many lost dogs have chips that were never registered or have outdated details. After implantation:

1. Register the number with the manufacturer or national database.
2. Verify your details.
3. Update the record whenever you move or change numbers.
4. Add an alternate contact.
5. Check the chip at the annual vet visit with a scan.

Costs

Implantation typically costs a modest fee, and some registries charge a registration or annual fee. Shelters and rescue organizations often include it in adoption fees. See dog vet cost guide.

Scanning and standards

Chips use international standards, often 15-digit ISO numbers, though older chips in some regions use other frequencies. Universal scanners can read most types. Ask your vet whether your dog's chip is ISO compliant.

What chips cannot do

• They do not track location.
• They do not store medical records, only a number.
• They can migrate slightly under the skin, so scan the whole body.
• They can fail rarely, so scanning at checkups is wise.

Chips and collars

Use both. A visible ID tag with your phone number helps neighbors contact you directly, while a chip is a permanent backup. GPS collars add real-time tracking. See best puppy collars, harnesses and leashes.

Microchips and travel

Many countries require microchipping for entry, usually before rabies vaccination. See dog travel health and rabies in dogs.

If your dog goes missing

1. Search the neighborhood and call his name.
2. Contact the registry, local shelters and vets.
3. Post on lost-pet sites and local groups.
4. Put up flyers.
5. Confirm your chip details are current.

Found dogs

If you find a dog, take him to a vet or shelter for scanning. Do not assume a chip is missing without scanning.

Questions to ask your vet

Ask which registry to use, whether the chip is ISO standard, where it was placed and how to update details. Ask to have it scanned at each annual visit.

Common mistakes

• Not registering the chip
• Forgetting to update details after moving
• Assuming the chip is GPS
• Skipping a collar and tag

Troubleshooting

• I cannot find my registration: ask your vet for the chip number and check registries.
• The scan failed: have a vet scan again, since chips can migrate.
• I adopted a chipped dog: transfer the registration to your name.

A simple plan

1. Microchip your dog.
2. Register and update details.
3. Use a collar with tags.
4. Scan at checkups.

Real-life examples

A lost spaniel is reunited with his owner within a day thanks to an up-to-date chip. A rescue dog's chip is registered to a previous owner and needs a transfer. A traveler needs a chip for entry to a new country. Registration is key.

Peace of mind

A chip is a small step with a big payoff.

The takeaway

Microchip, register and keep your details current. Combine it with a collar and tag.

This article is general educational information, not veterinary advice. Every dog is different. If your dog is unwell, or you are unsure about a symptom, diet change or medication, contact your veterinarian.