Last reviewed: 17 May 2026
TL;DR: Microchipping is compulsory for dogs across England, Scotland, and Wales and, since 10 June 2024, for cats in England. Owners must ensure that the chip is implanted by an authorised person, that the animal is registered on a DEFRA-approved database, and that contact details remain accurate. Failure to comply can result in a fine.
Key facts
- Dog microchipping has been compulsory in England since 6 April 2016 under the Microchipping of Dogs (England) Regulations 2015, with equivalent legislation in Scotland and Wales.
- Cat microchipping became compulsory in England from 10 June 2024 under the Microchipping of Cats and Dogs (England) Regulations 2023.
- Microchip data must be held on a DEFRA-approved database, and owners are responsible for keeping contact details up to date.
- Failure to comply with microchipping rules can result in a notice and a fine of up to £500 in England.
- Microchipping does not replace the requirement for dogs in public places to wear a collar and identification tag under the Control of Dogs Order 1992.
What this article covers
This article explains the United Kingdom's pet microchipping rules, the legislation behind them, the obligations on owners, and the practical steps involved in microchip registration and update. It focuses on dogs and cats, the two species currently subject to compulsory microchipping in parts of the UK. Other pet species are not covered by compulsory microchipping rules at the time of writing, although microchipping is widely used voluntarily.
Legal basis for compulsory microchipping
The compulsory microchipping framework for dogs in England was established by the Microchipping of Dogs (England) Regulations 2015, which came into force on 6 April 2016. Scotland and Wales introduced equivalent rules around the same time. The framework was extended to cats in England by the Microchipping of Cats and Dogs (England) Regulations 2023, which made cat microchipping compulsory from 10 June 2024.
The regulations set out who can implant a microchip, what databases the chip information must be held on, and what owners must do to keep records accurate. DEFRA approves the database operators that hold microchip data, and only chips registered on a DEFRA-approved database satisfy the legal requirement.
Obligations on dog owners
All dogs in England, Scotland, and Wales over the age of eight weeks must be microchipped, with limited veterinary exemptions where a vet certifies that microchipping would adversely affect the dog's health. The chip must be registered on a DEFRA-approved database with the keeper's current name, address, and contact details. Anyone keeping a dog that is not microchipped, or whose details are not up to date, can be served a notice requiring compliance within 21 days. Failure to comply can result in a fine of up to £500.
Microchipping does not replace the separate requirement under the Control of Dogs Order 1992 that dogs in public places wear a collar with the owner's name and address. Both requirements apply.
Obligations on cat owners
From 10 June 2024, all owned cats in England over the age of twenty weeks must be microchipped and registered on a DEFRA-approved database. The rule does not apply to free-living, unowned cats. The same maximum fine of £500 can apply where an owner fails to comply with a notice. The cat microchipping rule applies in England; readers in Scotland, Wales, and Northern Ireland should check the current rules in their nation, as the legislative position can differ.
Who can implant a microchip
The regulations set out who is permitted to implant a microchip. This includes veterinary surgeons, veterinary nurses acting under the direction of a vet, suitably trained and authorised individuals such as some animal welfare organisation staff, and student vets in supervised training. The implanter is responsible for recording the chip on a DEFRA-approved database and for providing the owner with the chip number and database details.
Keeping records up to date
The most common reason for non-compliance is failure to update contact details after a move or change of ownership. The chip number does not change for the life of the animal, but the owner's name, address, telephone number, and email address can. Owners are responsible for updating the record. Database operators typically charge a small fee for changes of keeper, and some offer free initial registration.
When a dog or cat is sold or given to a new keeper, the new keeper must update the database record. The previous keeper should not simply remove their details; the transfer process is the correct route. Where an animal is found straying, an authorised person, such as a local authority dog warden or a vet, can scan the chip and use the database to contact the registered keeper.
Microchipping and pet travel
Microchipping is also a baseline requirement for international pet travel under the Great Britain Pet Travel rules. Dogs, cats, and ferrets travelling under these rules must be microchipped before their primary rabies vaccination. An Animal Health Certificate, issued by an Official Veterinarian, then verifies that the chip number, vaccination, and other requirements are in order. Owners planning travel should check current gov.uk guidance, which is updated as international rules change.
Cost of microchipping
Microchipping is a one-off implant cost, sometimes included in the price of acquisition from a rescue or breeder. Many local authorities and animal welfare organisations run subsidised or free microchipping events, and some vets offer microchipping at routine appointments. Beyond the implant cost, there can be small fees for database registration changes, although a basic record is typically free or low-cost.
What to watch for
Owners should check immediately after acquiring an animal that the microchip number on the paperwork matches the chip detected by a scanner, and that the database record names them as the current keeper. A common problem is that breeders or rescues register themselves as the original keeper but the new owner is never added. In that case the chip information will not lead to the current owner if the animal is found straying.
Owners should also store the chip number and the name of the DEFRA-approved database in a secure place, separate from any single device, so that information is accessible if the animal goes missing. There are several approved databases in the UK, and an owner may need to check more than one if records have been transferred over time.
Important disclaimer
This article is general information based on UK government and industry sources and does not constitute financial, veterinary, or legal advice. Costs and rules vary; readers should check current gov.uk guidance and consult a vet or FCA-authorised adviser before significant spending decisions.
Frequently asked questions
Is microchipping compulsory for all pets in the UK?
No. Microchipping is compulsory for dogs in England, Scotland, and Wales, and for cats in England from 10 June 2024. Other pet species are not currently subject to compulsory microchipping rules in the UK.
What is the penalty for not microchipping a pet?
Owners can be served a notice requiring compliance within 21 days, and failure to comply can result in a fine of up to £500 in England. Scotland and Wales have equivalent enforcement frameworks for dogs.
Who can implant a microchip?
Vets, veterinary nurses under a vet's direction, suitably trained and authorised individuals from some animal welfare organisations, and student vets in supervised training can implant microchips under the regulations.
What should owners do when they move house?
Owners should update their contact details with the DEFRA-approved database that holds the chip record. Most updates can be done online for a small fee or sometimes free.
Does microchipping replace the dog collar and tag requirement?
No. The Control of Dogs Order 1992 still requires dogs in public places to wear a collar with the owner's name and address. Microchipping is a separate requirement.
Is microchipping required for international pet travel?
Yes. Dogs, cats, and ferrets travelling under the Great Britain Pet Travel rules must be microchipped before their primary rabies vaccination, and the chip number is recorded on the Animal Health Certificate.
