This is an X-ray of a dog’s bent front leg. See that tiny white spec? That’s a microchip! It has migrated down the leg FAR from where it was originally inserted, between the dog’s shoulders. This is actually quite common.
When lost pets are scanned, the entire body SHOULD be scanned to catch potential microchips that have migrated. But, as an owner, it is your responsibility at their ANNUAL pet exam to ask for a quick scan to make sure that:
(1) The microchip is still working.
(2) The location of the chip is good.
(3) That the microchip information is correct.
Remember, microchips save lives and reunite families with their pet. It's very easy to just have it checked regularly and ensure that your contact information on the microchip is up to date!