The Dogs Trust website holds a range of information on the new microchipping rules and how to find centres offering free microchipping. The British Veterinary Association has a range of information on microchipping and your responsibilities.[RJ(1] 

No. The microchip is aligned to a specific database. It is important you research the databases available and check with the implanter (e.g. vet) as to which chips they use and which database they are aligned to.

No. In accordance to the Animal Welfare Act 2006, if a certified working dog has qualified for tail docking then the owner needs to ensure that it is microchipped before it is three months old rather than the eight-week period for other dogs.

No. A dog could be tattooed alongside the microchip but the microchip still has to be present.

The law states that “microchipping doesn’t have to happen as long as a veterinary surgeon certifies, on a form approved by the secretary of state, that the dog shouldn’t be microchipped for reasons of the animal’s health”. This means that a dog needs to be checked by a vet to determine whether it is fit enough to be microchipped or not and is entirely at the vets’ discretion. Its age will not automatically disqualify it from the microchipping scheme.

Any adverse effects such as microchip failure, microchip migration or reactions to implantation should be reported to Veterinary Medicines Directorate’s Microchip Adverse Event Reporting Scheme. The microchip should then be replaced.

When a pet is found, the animal professional (e.g. vet or a dog warden) will scan for a microchip. The unique code will be read, and contact will be made with the database the pet is registered with. The staff at the database will perform security checks before releasing any contact details.

Databases usually charge a premium cost that will cover any change to the microchip details over the lifetime of your dog (while in your care) but you should check with the database operator.

The microchip number will be on the confirmation letter or email sent by the microchipping database you chose to register with. However, if these have been misplaced then the easiest way of recovering your details is to contact the vet or company who carried out the procedure as they should have a record of the microchip number. The other option is to take your dog into the vets or an animal shelter and have the microchip scanned.