QR tag, microchip, GPS or engraved?

There isn't one — the right answer is a microchip and a tag together, because they fail in opposite ways. A microchip cannot fall off but needs a scanner, so it only helps once your pet reaches a vet or shelter. A tag works instantly for the neighbour who actually picked your dog up, but it lives on the collar and the collar can come off. Each one covers the other's weakness, which is why using both costs little and removes most of the risk.

Usually not, and the reason is not the chip. An Ohio State University study of shelter animals found microchipped dogs were returned to their owners 52.2% of the time against 21.9% for strays generally — a real improvement. But only 58% of those microchips were actually registered with the owner's contact details, and the most common reason an owner could not be reached was simply a wrong or disconnected phone number. The hardware almost always works. The paperwork behind it often does not.

Yes, because most lost pets are found by ordinary people rather than shelters. A neighbour who picks up your dog has no scanner and no reason to drive to a vet — but they do have a phone. A tag is what turns that person into the one who brings your dog home, usually within the hour, instead of your dog entering the shelter system at all.

For most people, yes — for one reason that has nothing to do with technology. An engraved tag is permanent, which sounds like a strength until your number changes. Then it is silently wrong, and you will not notice. A QR tag points at a page rather than at a number, so a new phone, a new email or a house move means editing one field instead of buying new hardware. Engraving still wins on one thing: it needs no phone, no data and no company to stay in business.

They are worth it for a specific dog: an escape artist, a hunting breed, or one that bolts in thunderstorms. For that dog, live location is worth real money. For everyone else they are expensive — a cellular tracker runs $470 to $640 over five years once the subscription is counted, against under $10 for a QR tag. They also need charging, and they depend on a company staying in business. Whistle shut its service down in August 2025 and customers' trackers stopped working.

No, and the difference matters when your pet is actually missing. An AirTag has no GPS and no cellular connection — it reports its position only when someone else's iPhone passes close enough to hear it. In a busy neighbourhood that works well. In woodland, farmland or anywhere quiet, the map simply stops updating. It is excellent value at $29 with no subscription, as long as you understand it is a Bluetooth tag rather than a tracker.

It depends where you live, and the rule is usually about rabies rather than identification. In North Carolina, for example, G.S. 130A-190 requires a dog to wear its rabies tag at all times, indoor-only dogs included. That tag proves vaccination — it carries no contact details, which is why most owners add an ID tag beside it. Check your own city and county, because licensing rules vary even between neighbouring ones.

Three, and we would rather say them than not. It lives on the collar, so it goes wherever the collar goes. The code can be scratched through if it takes real abuse, though normal wear is fine. And the finder needs a phone with data — almost everyone has one, but not everywhere has signal. There is a fourth worth naming: a QR tag depends on the company behind it still running the page. That is true of us as much as anyone, and it is a fair reason to keep a microchip as your permanent backup.