Microchipping (also known as an ID chip)
A microchip implant is an identifying integrated circuit placed under the skin of a dog, cat, horse, parrot or other animal. The chip, about the size of a large grain of rice, uses passive RFID (Radio Frequency Identification) technology, and is also known as a PIT tag (for Passive Integrated Transponder) . (Wikipedia)
The microchip contains a unique ID number which can be read when scanned using a micro chip reader, a bit like scanning your shopping at the local supermarket.
Once the number has been read, the National database can be used to access the owners contact details.
This is the quickest way to identify an animal and to return it to it's owner. There have been cases of cats being returned to their owners, many years after going missing, solely due to a micro chip.
Cat flaps can be purchased which can be programmed to only open and allow access to a cat whose micro chip is identified by the cat flap reader.
Microchip National Databases
There are 4 National Databases, your pet could be registered on.
If you are unsure then visit this website, enter the chip number and it will tell you who to contact
If micro chipped at this practice it will be recorded on Anibase.
They charge £6.00 for each request to amend records, or you can join their ‘Locate’ scheme for a one off fee of £17.95 per animal, which lasts for 8 years and allows multiple changes to contact details