What migration actually means
Microchips are implanted between the shoulder blades, but in some dogs the small chip gradually shifts position under the skin, settling toward one shoulder, lower down the neck or occasionally further along the body. Migration does not switch the chip off, and the number stays the same. The real risk is practical: anyone scanning a lost dog usually starts over the shoulder blades, and a chip that has moved can be missed by a fast, narrow scan. Your vet's finding is therefore valuable information, not bad news on its own.
Pin down what the vet found
While you are still at the practice, ask precise questions. Where exactly did the scanner pick the chip up? Did it read strongly and consistently, or only at a certain angle? Ask the vet to record the new location in plain, findable words in his clinical notes, so a different vet at a different practice understands it later. If the chip could not be read at all, that is a different conversation: ask what the vet recommends next, rather than assuming a replacement or any procedure without their guidance.
Update every record that describes him
Go home and update the chip registration database entry for your dog, checking that your phone numbers and address are current at the same time, because a readable chip only helps if the contact details behind it work. Add the migrated location wherever his description lives: his vet record, any profile you keep for sitters, and the notes a dog walker or boarder would see. Tell anyone who regularly handles him — your dog walker, groomer and regular boarder — where the chip now sits, so they can pass it on instantly if he is found while in their care. If his chip is ever searched for, the person scanning needs to know to sweep wider — across both shoulders, down the neck and along the sides — instead of stopping at the usual spot.
Add a backup that does not depend on scanning technique
A migrated chip is the strongest argument for visible, layered identification. A collar tag with your current number helps anyone who finds him, and a scannable collar ID helps even if he slips his tag or the finder has no idea where chips sit. Layering matters because each method fails differently: tags can tear off, chips can be missed, but they rarely all fail on the same day. Check the collar fit and tag legibility as part of this tidy-up, since backup identification only counts if it is actually on him.
Build rechecking into routine visits
From now on, ask for a quick chip check at his regular vet visits and make a note of where it reads each time. A chip that has moved once can creep again slowly, and a short history of positions tells you whether it is stable or still travelling. If readings become inconsistent, or the chip seems to have moved a long way in a short time, raise it with the vet promptly rather than waiting for the next routine appointment. Alongside the chip itself, KinsLe's Verified QR ID Pet Profiles mean a finder who scans his collar reaches his profile and you directly, whatever a hurried chip scan might miss.