Dog Microchipping Law in the UK: What Every Owner Must Do

The dog microchipping law in the UK is one of the few pet rules that carries a real fine, yet the part that catches most owners out is not the chip itself but keeping the registered details current. A chip with an old phone number or a previous address is, in practice, useless: it will not reunite you with a lost dog and it does not satisfy the law. This guide sets out exactly what you must do, by when, and what happens if you do not.

Every dog must be microchipped by eight weeks

Since 6 April 2016, the law across England, Scotland and Wales has required every dog to be microchipped and registered on a government-approved database by the time it is eight weeks old. That remains fully in force. A microchip is a small implant, about the size of a grain of rice, placed under the skin between the shoulder blades, holding a unique number that links to your contact details on a database.

Northern Ireland has required dogs to be microchipped since 2012 as part of its dog licensing rules, so wherever you are in the UK, an unchipped dog is breaking the law.

Whose responsibility it is

Responsibility shifts as a puppy changes hands, and this is where confusion creeps in:

• The breeder must microchip every puppy and register themselves as the first keeper before the puppy is eight weeks old or sold, whichever comes first.
• The new owner must update the database so the dog is registered to them once they take the puppy home. Buying a puppy does not automatically transfer the chip record; you have to do it.

If you are buying a puppy, ask to see proof it is already chipped and registered. A breeder who cannot show this is not complying with the law, which is a warning sign about the rest of their practices.

Keeping your details up to date

This is the duty owners most often overlook. You, as the registered keeper, are legally responsible for keeping your details accurate on the database. That means updating them whenever you:

• Move house or change your address.
• Change your phone number.
• Rehome the dog or take on a dog from someone else.

Updates should be made promptly, and databases typically ask for changes within 21 days. There is usually a small fee to amend your record, but it is trivial next to the value of actually getting your dog back. An out-of-date chip is the single most common reason a found dog is not reunited quickly with its owner.

The fine for not complying

If your dog is found without a working, correctly registered microchip, you will normally be served a notice giving you 21 days to have the dog chipped and the record put right. Comply within that window and there is usually no penalty. Fail to, and you can face a fine of up to £500.

The chip must be implanted by a qualified professional: a vet, a veterinary nurse, or a trained and approved implanter. It is not something to attempt yourself.

Microchipping is not the same as a collar tag

A microchip is a legal requirement, but it does not replace the separate rule that a dog in a public place must wear a collar with the owner’s name and address on a tag. The two work together: the tag gets a found dog home fast without any equipment, while the chip is the permanent, tamper-proof backup that a vet or warden can scan. Responsible owners keep both current.

What to do right now

• If your dog is not chipped, book an appointment with your vet to have it done.
• If it is chipped, log in to the database and check your name, address and phone number are correct today.
• If you have recently moved or changed your number, update the record now rather than waiting.

For the official rules and the list of approved databases, see the government’s guidance on getting your dog or cat microchipped on GOV.UK. Cat owners should also read our guide to the cat microchipping law in the UK, which became compulsory more recently. If you are choosing services for a new dog, our advice on what vaccinations your dog needs before boarding is a useful next read.

Frequently asked questions

Is it a legal requirement to microchip a dog in the UK? Yes. Every dog in England, Scotland and Wales must be microchipped and registered on an approved database by eight weeks of age, and dogs in Northern Ireland must be chipped too. An unchipped dog breaks the law anywhere in the UK.

What is the fine for not microchipping a dog? If your dog is found without a valid, registered microchip, you are usually given a notice with 21 days to put it right. If you do not comply within that time, you can be fined up to £500.

Do I have to update my dog’s microchip details if I move house? Yes. As the registered keeper you are legally responsible for keeping your contact details accurate, so you must update the database when you move, change your phone number, or rehome the dog. An out-of-date record is the main reason lost dogs are not reunited with their owners.

Who is responsible for microchipping a puppy? The breeder must microchip the puppy and register as its first keeper before it is eight weeks old or sold. When you buy the puppy, you must then update the database to register the dog to you; this does not happen automatically.

Does a microchip replace a collar and ID tag? No. A microchip is a separate legal requirement. The law still requires a dog in a public place to wear a collar with the owner’s name and address, so responsible owners keep both the tag and the chip details up to date.