Smaller than a grain of rice

Permanently implanted under the skin of the back using hypodermic needle, even small puppies and kittens can have a microchip implanted during a regularly scheduled vaccine appointment, with minimal discomfort and no down time. Once implanted, your information is added to a database that is accessible by scanners used at any veterinary office or animal shelter across the country. Scanning for a microchip is as easy as passing a handheld device over the animal's back. If present, the microchip provides an identification number that can be referenced in the database. Microchips have become so commonplace in our pet population, it is now the first thing we look for when a lost pet is brought through our doors.