Microchips are tiny — about the size of a grain of rice — but they carry a unique ID number that connects your pet to you. The ID number links to an online account containing your contact information. Once implanted (which feels a lot like getting a shot), the chip stays with your pet for life. And if your furry friend ever ends up in a shelter or vet’s office, they’ll be scanned for a chip. The scanner displays the ID number, which a shelter worker, veterinarian, or animal control officer can use to look up your contact information and reunite you with your beloved pet.