A microchip is a tiny, permanent ID that gives a lost dog its best chance of coming home. Studies of shelters consistently find that microchipped dogs are far more likely to be reunited with their owners than those without. This guide explains how a microchip works, the quick and nearly painless procedure, and the step owners most often forget — registering and keeping your details up to date. A chip is a backup to, not a replacement for, a collar and ID tag.
How a microchip works
A microchip is a small electronic capsule about the size of a grain of rice, implanted under the skin between the shoulder blades. It is not a GPS tracker — it does not transmit a location or need a battery. Instead it stores a unique ID number. When a vet, shelter or rescue passes a handheld scanner over the dog, the chip is energised and displays its number. Staff then look that number up in a national pet registry to find the owner’s contact details. That simple, permanent link is what turns a found stray back into a family pet.
The procedure
- Quick and routineA vet or trained professional injects the chip with a needle — it takes seconds.
- Minimal discomfortIt feels like a normal vaccination; no anaesthetic is needed, though it can be done during spay/neuter.
- Any agePuppies and adult dogs alike can be chipped; many puppies are chipped before going to new homes.
- LifelongOne chip lasts the dog’s lifetime — there is nothing to recharge or replace.
Registration: the step people forget
The chip number must be registered to you in a pet-recovery database, and that is where many owners fall down. After chipping, confirm your dog’s chip is registered with your name, address and phone number, and update the record every time your contact details change — a new phone number or a house move is the most common reason a chip fails to reunite a dog. It is worth asking your vet to scan the chip at annual check-ups to confirm it is present and readable.
Chips plus tags: belt and braces
A microchip is a permanent backup, but a visible collar and ID tag is still essential — a member of the public who finds your dog can read a tag instantly, whereas a chip needs a scanner. Use both. Combine them with everyday safety habits: a secure garden and good recall (see building a reliable recall), so your dog is less likely to go missing in the first place. In many places microchipping is also a legal requirement — check your local rules. Together, a chip, a tag and good training give a lost dog the best possible odds of getting home.
Frequently Asked Questions
Is microchipping a dog painful?
No more than a routine vaccination. The chip is injected under the skin between the shoulder blades with a needle in a few seconds, and no anaesthetic is needed, though it can be done during spay or neuter surgery.
Is a dog microchip a GPS tracker?
No. A microchip does not transmit location and has no battery. It simply stores a unique ID number that a scanner reads, which is then looked up in a registry to find the owner's contact details. For live location you need a separate GPS device.
Do I need to register the microchip?
Yes — this is essential. The chip number only helps if it is linked to your current contact details in a pet registry. Register the chip after implanting and update it whenever you move or change phone number, or a reunion may fail.
Does my dog still need a collar and tag if it is chipped?
Yes. A microchip is a permanent backup, but a visible collar and ID tag let anyone who finds your dog contact you immediately without a scanner. Use both for the best chance of a quick reunion.
Sources
- American Veterinary Medical Association (AVMA) — microchipping of animals FAQ
- American Kennel Club (AKC) — dog microchipping facts and registration
- ASPCA — microchips and lost pet recovery
Last updated 25 June 2026.
