TL;DR: A microchip does not track your dog. It is a passive ID chip with no battery and no GPS, readable only by a scanner held against your dog's shoulders. A GPS tracker is the device that shows you where your dog is right now. The chip gets your dog home after someone finds them. The tracker helps you find them first.
This is probably the most common misunderstanding in dog ownership. Plenty of owners believe that because their dog is chipped, they could pull up a location if the worst happened. That is not how a chip works, and the gap matters most on the one day you need it.
Does a microchip track your dog?
No. A pet microchip is a passive RFID transponder about the size of a grain of rice, sitting under the skin between the shoulder blades. It has:
- No battery. It is powered only by the scanner's radio field, for the second it is being read.
- No satellite connection. It cannot see GPS satellites and has no way to talk to one.
- No location data at all. It stores a number. That is the whole payload.
Read range is roughly 1 to 6 inches (2 to 15 cm). Somebody has to be holding your dog and passing a scanner over them. There is no version of a standard pet microchip that reports where your dog is.
So what does a microchip actually do?
It links your dog to you, permanently. The number on the chip points to a record in a pet database with your name and phone number. When a vet, shelter, warden, or rescue scans a found dog, they call you.
That is genuinely valuable, and in many countries including the UK and across most of the EU, chipping is legally required. A chip cannot fall off, cannot be removed by a thief in a parking lot, and lasts your dog's whole life. It is the best permanent ID there is.
Its limit is simple: it is reactive. It only works after a stranger has already caught your dog and got them to someone with a scanner.
What does a GPS tracker do instead?
A GPS tracker is an active device on your dog's collar with its own battery and cellular connection. It answers a different question: where is my dog, right now?
- Live location on a map, usually refreshing every few seconds when you are actively searching.
- Escape alerts if your dog leaves a safe zone like the yard.
- A trail to follow rather than a neighborhood to guess at.
The trade-offs are real too. It needs charging, it needs cellular signal, and it only works while it is on the collar. A collar can slip off in a hedge. That is exactly why it does not replace the chip.
Microchip vs GPS tracker: side by side
| Microchip | GPS tracker | |
|---|---|---|
| Shows live location | No | Yes |
| Needs charging | No | Yes |
| Works if the collar comes off | Yes | No |
| Lasts the dog's lifetime | Yes | No |
| Helps in the first hour | Rarely | Yes |
| Legally required in many countries | Often | No |
Read down that table and the answer stops being either-or. They fail in opposite ways, which is precisely why they pair well.
Which dogs most need a tracker on top of the chip?
Some dogs are chip-and-relax. Others are not. Consider a tracker seriously if your dog:
- Has ever bolted from fireworks, thunder, or traffic
- Goes off-leash in woods, fields, or open hills
- Is a scent hound or sighthound, like a beagle, basset, or whippet, that will follow a trail or a hare for a mile without looking back
- Is young with a recall still under construction
- Is deaf, elderly, or cognitively declining and can drift away disoriented
If your dog has a solid recall and never leaves your side, the chip plus a well-fitted collar tag may be all you need. Be honest about which dog you actually have, not the one you are training toward. Our guide on how to stop your dog running away covers the training side of this.
Where Rocket fits
Rocket is an activity tracker with GPS on your dog's collar, paired with an app. Day to day, most of what you use it for is ordinary: steps, active minutes, rest, and whether this week looked like last week. The location side is the part you hope stays boring, right up until the afternoon it does not.
We think of it the way runners think of a watch. You wear it for the daily numbers, and you are quietly glad it is there when something goes wrong. It sits alongside the chip rather than replacing it. You can see what Rocket tracks on the Run With Rocket homepage, and if you are weighing device types, our breakdown of GPS trackers vs activity trackers goes deeper.
The one microchip job people forget
If you do nothing else after reading this, do this: check that your chip registration details are current.
Shelters report the same story constantly. They scan a found dog, get a clean chip number, call the registered phone, and reach a disconnected line or a previous owner. The chip did its job and still nothing happened.
Find your chip number on your dog's paperwork or ask your vet to scan them, look up which database holds the record, and confirm the phone number and address. It takes ten minutes and it is the cheapest safety improvement available to you.
The bottom line
A microchip is permanent ID, not a tracker. A GPS tracker is location, not ID. The chip brings your dog home when a stranger finds them. The tracker helps you be the one who finds them, in the first hour, when most lost dogs are still close by.
If your dog ever gets out, our step-by-step guide to what to do if your dog gets lost walks through the first 24 hours. And if the monthly fee is what's holding you back, see which dog trackers work without a subscription.