The chip number and the register are the two keys
A microchip itself stores only a number; the ownership details live on a database held by a chip register. Transferring your adopted dog into your name therefore means updating that database, not doing anything to the chip under her skin. Start by asking the rescue, breeder, or previous owner for the chip number and which register holds it; good rescues include both in the adoption pack. If the paperwork is missing or vague, any vet, rescue, or dog warden can scan your dog and tell you the number on the spot, and the register can usually be identified from the number itself.
Work through the register's transfer process
Contact the register directly, through its website or phone line, and follow its ownership transfer route. Many registers need the previous keeper to confirm the release, or ask for adoption paperwork if the previous keeper cannot be reached, which is one reason to start while the rescue still has your file open and staff remember the adoption. Provide your full name, current address, and a phone number you actually answer, plus an emergency second contact if the register allows one. Some registers charge a small administration fee for transfers or upgraded accounts; what matters is completing the process and receiving confirmation, not which tier you choose.
Verify the change actually landed
Do not file the adoption paperwork the moment you submit the form. Wait for written confirmation, then verify independently: ask your vet at the first check-up to scan the chip and read back the details the register returns, or use the register's own lookup if it offers one. Mismatches do happen, a mistyped digit in a phone number, an old address surviving in a second field, and the only time this matters is the worst time, when your dog is lost and a finder is relying on that database. Check that the name, address, and phone are all yours and all correct, character by character.
Handle the awkward cases calmly
If the previous owner is uncontactable, the rescue has closed, or a private rehoming left no paperwork, tell the register exactly that; they have established routes for disputed or orphaned registrations and may ask for vet records, adoption adverts, or a signed declaration as evidence. Keep copies of everything you send. If you discover the dog was never chipped at all, which still happens with older dogs and informal rehomings, your vet can chip her during a routine visit and register your details fresh, closing the gap entirely.
Finish the wider handover, not just the chip
The chip is one piece of an adopted dog's identity trail. In the same week, update the vet registration, insurance details if you take a policy over, collar tag engraving, and any council or local registration your area requires, so every route back to you agrees. Bring her previous vet history across to your new clinic too. Alongside the chip transfer, KinsLe's Transferrable Profiles brings her profile over to you with history, records, and routines preserved, so her documented life continues rather than restarting from a blank page.