Country-by-country requirements and sources

UK Pet Microchipping Laws

Dogs must be microchipped and registered by eight weeks old throughout the UK. Compulsory microchipping of ordinary pet cats currently applies in England, where cats must be registered by 20 weeks old. Keepers are responsible for accurate database details.

The rules at a glance

• Dogs: compulsory microchipping and database registration by eight weeks old across the UK, subject to limited exemptions.
• Cats in England: compulsory microchipping and registration by 20 weeks old, including indoor cats.
• Cats elsewhere in the UK: ordinary pet microchipping is voluntary, though it remains useful for reunification and separate travel rules may apply.
• Keeper details: the registered keeper must keep the database record accurate and update changes of address, contact details and keepership.

England

The Microchipping of Cats and Dogs (England) Regulations 2023 cover dogs over eight weeks and cats over 20 weeks. A compliant record includes both an implanted microchip and the required details on a database meeting the regulations. Health exemptions require veterinary certification. Imported cats and dogs must meet the rules within 30 days of entering England.

A cat or dog must be microchipped before transfer unless a health exemption applies. When keepership changes, the new keeper must record their details unless the previous keeper has already done so. An authorised person can issue a 21-day compliance notice; failure to comply can lead to a fine of up to £500.

Read the detailed England cat microchipping guide.

Scotland

The Microchipping of Dogs (Scotland) Regulations 2016 require dogs over eight weeks old to be microchipped and registered. Dog keepers must notify the database of changes to the registered details. The Scottish Government guidance says incorrect details can lead to a fine of up to £500. Cat microchipping is voluntary for ordinary pet ownership.

Wales

The Microchipping of Dogs (Wales) Regulations 2015 govern compulsory dog microchipping. Welsh Government guidance confirms that dogs must be microchipped and registered by eight weeks old. Wales does not currently require ordinary pet cats to be microchipped.

Northern Ireland

The Dogs (Licensing and Identification) Regulations (Northern Ireland) 2012 operate alongside dog licensing. Dogs must be microchipped at eight weeks and before a licence is issued. The registered details must remain accurate and accessible to council officers. See the official nidirect dog licensing and microchipping guide. Cat microchipping is voluntary for ordinary pet ownership.

Breeders, transfers and new keepers

First-keeper and transfer requirements differ between jurisdictions and animal types. Before buying or rehoming a pet, ask for the microchip certificate or other proof and make sure the database record is transferred promptly. Breeders using ChipHERO can follow the breeder workflow; new keepers can use the pet owner guide.

Official overview

GOV.UK maintains a concise overview of the current dog and cat rules and the databases that meet government standards: Get your dog or cat microchipped.