How to Tell If a Dog Has a Chip Inside Him
A microchip is a tiny electronic chip enclosed in a glass cylinder. It is about the size of a grain of rice, and it is injected under a dog's skin using a hypodermic needle. The chip is inactive until it is scanned by a reader. At that point, it returns an identification number that is connected to a service that provides the owner's information. If you have found a stray dog, one of the first things to do is to find out whether it has a microchip.
Call a local veterinarian's office or the Humane Society.
Ask the veterinarian's office or Humane Society if it is able to check for a microchip on a stray dog.
Take the dog to the office and ask the employees to check for a microchip. A veterinarian or a veterinary technician will scan the animal and find out whether it has a microchip implanted, and whether current contact information is available for the owner.