A microchip links a dog to its registration details. It is one of the most important checks when buying or selling a puppy, because it helps prove identity and traceability. The chip number in the dog must match the number in the passport and registration documents.
What the seller should arrange
A puppy should be chipped and registered before transfer. The seller should provide the chip number, the EU pet passport and vaccination details. Be cautious if a puppy has no passport, if the chip cannot be checked, or if the seller says registration can be arranged later without proof.
What the buyer should do
At collection, ask the veterinarian or seller to scan the chip and compare it with the passport. After transfer, update the registration to your own details within the required period. Keep the passport safe, because it contains vaccination records and is needed for travel.
Why this matters
Correct identification protects the dog and the buyer. It makes lost dogs easier to return, discourages illegal trade and helps authorities trace problems. If the paperwork is vague, postpone the purchase and use the broader checks in our puppy buying guide.
