Microchipping is one of the most effective tools for reuniting lost cats with their owners, but a persistent misunderstanding about what the technology actually does leads some owners to either skip it or rely on it in ways it wasn't designed for.
It's not a tracking device
A microchip has no GPS, no battery, and no way to locate a cat in real time — it's a small, passive chip about the size of a grain of rice, implanted under the skin between the shoulder blades, that stores a unique ID number readable only when a compatible scanner is passed directly over it. If you want real-time location tracking, that requires a separate GPS collar device, which is a different technology entirely.
How it actually reunites lost cats
When a lost cat is brought to a shelter or vet clinic, staff scan for a microchip, and if one is found, they look up the ID number in a registry database, which returns the owner's contact information — assuming that information is current. This is the critical, often-missed step: the chip itself does nothing without accurate, up-to-date registration behind it.
Registration is a separate step from implantation, and it's the part owners forget
Having a chip implanted doesn't automatically register your contact information — you (or your vet clinic, depending on their process) need to complete registration with the specific microchip company's database, and this registration needs to be updated whenever your phone number or address changes. An unregistered or outdated-registration chip is nearly as unhelpful as no chip at all.
Multiple registries exist, which is where confusion often happens
There are several microchip manufacturers and databases, and not every shelter or vet scanner automatically checks every registry. Universal scanners that check multiple frequencies are now standard at most shelters, which has reduced this problem, but ensuring your specific chip is registered with its correct, corresponding database remains the owner's responsibility.
The procedure itself is quick and low-risk
Implantation takes seconds, similar to a routine injection, and can be done during a regular vet visit without sedation for most cats. Some minor, temporary discomfort at the injection site is normal; significant swelling or ongoing pain at the site is not and warrants a follow-up call to your vet.
A collar with an ID tag is still worth having, alongside the chip
A visible tag gives an immediate way for anyone who finds your cat to contact you without needing a scanner or database lookup — the two methods work best as a pair, not as substitutes for each other, since a tag can fall off but a microchip generally can't, while a chip requires someone to actually scan for it.
Check your registration periodically
It's worth checking your microchip registration is current at least once a year, particularly after any move or phone number change — this is a genuinely common gap, since the registration step happens once at implantation and is easy to forget about for years afterward.