A microchip is the size of a grain of rice, and has a unique number and contact information. The information is registered on a database for life.
If your pet is lost, a vet can scan your pet and find out your address.
The microchip is easy to implant, and no anaesthetic is needed.
A certificate will then be issued showing you as the owner.
Remember to tell the microchip company when your or your dog moves home, changes owner or gets a new phone.
Most vets can microchip your dog, and prices range between £20 and £30.
Dogs' Trust provides free or cheap microchipping.
Manchester & Cheshire Dogs Home offers cheap microchipping.