Short answer: start searching right away and tell as many people as you can. Dogs Trust and the RSPCA both list the steps below.
Contact your microchip database and report your dog missing. Dogs Trust says they can notify you if someone tries to change your dog's chip details. Check that your contact details are right.
Dogs Trust suggests contacting all the vets in your area and asking to put up a poster, asking shops and libraries to display one, telling local dog walkers, and posting clear photos and details on social media. The RSPCA also suggests using lost and found services for pets.
Keep a recent photo and make sure your dog's ID and chip are current. Practice recall in safe places: see emergency recall and bolting out the door.
If your dog was hurt or is found injured, take them to a vet.
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