Unlike the identifying collar tags mentioned above, the appropriate database keeper cannot always be determined from the ID number, complicating the task of returning the pet to its owner.
A potential downfall is that if the pet's information is not registered with all databases, a thief can steal the animal using the secure and tamper-proof' ID device.
Then, they can register the stolen pet with another database and sell the animal, transferring an apparent clear title in the form of a login account at, or registration document from, the second registry.
A drawback of metasearch engines is that many shelters do not have the resources to search registry sites for owner information once they access the chip number.
A typical pet microchip registration costs $25 to $100 per year, and it is incumbent upon the owner to maintain the accuracy of the database in the event of a move or change in contact information.
[8] Registering and keeping the owner's contact information up-to-date is a problem facing the pet microchip industry.
According to an Ohio State University study, the main reasons owners aren't found for lost pets included incorrect or disconnected phone numbers (35.4%), the owner's failure to return phone calls or respond to letters (24.3%), unregistered microchips (9.8%), or microchips registered in a database that differed from the manufacturer (17.2%).
There are free registration databases available, such as those at Veripet's Rabies Reader Page and Found Animals Microchip Registry are chip manufacture agnostic.