UK Dog Law: Microchipping and ID Tags Explained

Ask most dog owners whether their dog is “legal” and they will point to the microchip. It is the right instinct, but it is only half the answer. UK law actually asks for two separate things, and a huge number of otherwise careful owners are unknowingly breaking one of them every time they leave the house. This guide sets out exactly what each law requires, why both matter, and how to get and stay on the right side of them.

Two Separate Laws, Both Apply at the Same Time

The confusion is understandable. Microchipping feels like the modern, permanent form of identification, so it is easy to assume it replaces the old-fashioned collar and tag. It does not. The two requirements come from different pieces of legislation, cover different situations, and are enforced separately.

A microchip proves who a dog belongs to once someone, usually a vet or a council warden, has the dog in hand and a scanner to hand. A collar and tag do the identifying job on the spot: anyone who finds your dog wandering, with no scanner and no special equipment, can read your details straight off the tag and get in touch immediately. The law requires both because they solve different problems.

Compulsory Microchipping in England

Since 6 April 2016, every dog in England over 8 weeks old must be microchipped, under the Microchipping of Dogs (England) Regulations 2015. According to gov.uk, this requirement in fact applies to all dogs across the UK, not just England.

The regulations carve out a narrow exemption for certified working dogs and for dogs a vet has certified should not be chipped for health reasons. Dogs brought into the country from abroad must be chipped within 30 days of import if they are not already. For the overwhelming majority of pet dogs, though, there is no exemption: chipping is compulsory, and it must be carried out by a trained professional, typically a vet, a local council microchipping scheme or a rescue centre (see gov.uk for the full detail, including the list of approved databases).

If you are still working through your new dog’s setup, our guide to essential dog accessories covers microchipping alongside everything else a new owner needs, including which items are optional and which are not.

Keeping Your Microchip Details Up to Date

A microchip is only as useful as the information linked to it. Every chip is registered against your name, address and contact details on one of the approved databases, and gov.uk is clear that keeping those details current is the owner’s responsibility, not the database provider’s and not your vet’s.

In practice this means updating your record with the database company whenever anything changes, most obviously if you move house, change your phone number, or rehome the dog to someone else. An out-of-date chip is, for practical purposes, close to useless: if your dog is found and scanned, the finder will be given your old address or a disconnected phone number, and the trail goes cold from there. Updating your details takes a few minutes online and is worth doing the moment anything changes, not weeks later.

The Collar and Tag Law: The Control of Dogs Order 1992

This is the requirement that catches people out. Under the Control of Dogs Order 1992, every dog in a public place must wear “a collar with the name and address of the owner inscribed on the collar or on a plate or badge attached to it.” This applies every time your dog is in a highway or place of public resort, regardless of how good their microchip records are.

The Order lists a small number of exemptions, including packs of hounds, dogs being used for sporting or working purposes such as driving livestock, dogs on official duty with the armed forces, customs or police, dogs engaged in emergency rescue work, and registered guide dogs. Outside of those specific categories, the rule applies to every dog owner. The RSPCA confirms plainly that “it’s a legal requirement for your dog to have a collar with an ID tag when out in public spaces”, alongside the separate microchipping requirement.

This Order applies in England, Scotland and Wales. Northern Ireland is a separate legal jurisdiction with its own dog control legislation, so if you live there it is worth checking the specific requirements that apply locally rather than assuming the same Order covers you.

What to Put on the Tag (and What to Leave Off)

The law is specific about what must appear: your name and address. A phone number is not a legal requirement but is sensible to add, since it is the fastest way for a finder to reach you.

Many owners choose to leave the dog’s name off the tag entirely. It is not required by law either way, but it is worth thinking about: a tag with the dog’s name on it lets a stranger call the dog over by name, which some owners would rather avoid, particularly with a nervous or reactive dog. Name and address (plus a phone number) covers the legal requirement without giving away anything you do not need to.

If you are setting up a new dog’s kit from scratch, our guide to fitting a dog harness is a natural next stop, since a well-fitted collar and a well-fitted harness are not always the same piece of kit.

Penalties for Getting This Wrong

Requirement	Legislation	What can happen
Dog not microchipped by 8 weeks	Microchipping of Dogs (England) Regulations 2015	Fine of up to £500
Microchip details not registered or out of date	Microchipping of Dogs (England) Regulations 2015	Fine of up to £500
No collar and tag in a public place	Control of Dogs Order 1992 (Animal Health Act 1981)	An offence dealt with by the local authority, which can result in a fine

The £500 figures for microchipping come directly from gov.uk, and apply separately to a missing chip and to missing or out-of-date registration, meaning both could theoretically apply at once. The collar and tag offence is enforced by council officers rather than the police, who also have powers to seize a stray or non-compliant dog under separate legislation. We have not quoted a specific fine amount for the collar and tag offence, since the exact figure depends on current sentencing rules that sit outside the Order itself.

Moving House or Rehoming a Dog

Both laws need attention at these moments. Update your dog’s microchip record with the database provider as soon as you have a new address, and swap the address on the collar tag at the same time so both sources of identification agree. If you rehome a dog, whether to a family member, a friend, or through a rescue, the microchip record needs to be transferred into the new owner’s name. Leaving an old owner’s details on the chip is one of the most common reasons a found dog cannot be reunited with its current owner quickly. A dog settling into a new home also benefits from a steady routine, and our guide to keeping a dog stimulated at home is worth a look during that adjustment period.

Differences Across the UK

Dog microchipping is a UK-wide requirement: gov.uk states that all dogs in the UK must be microchipped and registered by 8 weeks old, without carving out an exception for any nation. Cat microchipping is different: it is compulsory in England but optional in Scotland, Wales and Northern Ireland, according to the same gov.uk guidance.

For the collar and tag rule specifically, the Control of Dogs Order 1992 covers England, Scotland and Wales. We could not verify the exact detail of Northern Ireland’s equivalent collar and identification rules against a primary source, so if you are based there, check with your local council rather than relying on this article.

Frequently Asked Questions

If my dog is microchipped, do they still need to wear a collar and tag?

Yes. Microchipping and the collar and tag rule are two separate legal requirements that both apply at the same time. A microchipped dog with no collar and tag in a public place is still breaking the Control of Dogs Order 1992.

What exactly has to be on the tag?

By law, your name and address. Many owners also add a phone number, since it lets a finder contact you immediately. There is no legal requirement to include the dog’s name, and many owners deliberately leave it off.

How much does it cost to microchip a dog?

Costs vary by provider, whether that is a vet, a council scheme or a rescue centre, and some charities run low-cost or free microchipping events. Check with your own vet or local council for current pricing, since we have not quoted a figure we could verify.

What happens if I move house and forget to update the microchip details?

Your dog’s chip will still scan, but it will return your old address and contact details. If your dog goes missing, whoever finds them will not be able to reach you. Update your record with the database provider as soon as your address changes.

Does a puppy need a collar and tag before it is microchipped?

Yes. The collar and tag requirement applies whenever a dog of any age is in a public place, regardless of whether the microchipping deadline has been reached yet.

Is this article legal advice?

No. This is general information based on the legislation and official guidance available at the time of writing. For advice on a specific situation, contact your local council or a solicitor.