Comment by 0cf8612b2e1e

Maybe there is no need for a centralized database of contact information, but there could be one for found pets.

Single resource. Any vet/shelter/guy with a RFID scanner can report found pet with this barcode at approximately this location. If you know this pet, contact us here. Presumably only vets and shelters would be adding to the database, so all of the contact information is already public. People who have lost their pets can then monitor this location/sign up for alerts after you lose Fluffy.

Not as great as being able to immediately lookup the owner, but eliminates some privacy concerns.