UK Pet Microchipping Law: What Owners Actually Need to Know

Most dog and cat owners in the UK know their pet needs a microchip. Fewer realise that microchipping and the older legal requirement to wear a collar and tag are two separate duties, and that missing either one carries its own fine.

What the microchipping law actually requires

Microchipping has been compulsory for dogs across Great Britain since 6 April 2016, and the requirement now sits within The Microchipping of Cats and Dogs (England) Regulations 2023, which also brought cats into scope. As of 10 June 2024, every cat in England must be microchipped and registered on an approved database by 20 weeks old, including cats that never leave the house.

The Royal College of Veterinary Surgeons notes that Scotland and Wales have their own separate dog microchipping regulations, and Northern Ireland has required dog microchipping since 2012 under different legislation again, so the exact rules can vary slightly depending on where in the UK you live.

A microchip on its own is not enough. Owners must also register their contact details with one of the government approved databases, and keep those details current. If you move house or change your phone number without updating the register, the chip becomes far less useful the moment it is actually needed.

If you are buying a puppy

Responsibility for that first microchip does not sit with the new owner. Under UK law, it is the breeder who must have a puppy microchipped and register their own details as its first keeper before the puppy is sold, and puppies cannot legally be sold before eight weeks old in any case.

The RSPCA confirms that puppies must be microchipped before they can be sold, and that it is the breeder's responsibility to register their details first. When you take a puppy home, the breeder's details are still on the chip until you update the registration yourself, so this is worth doing in the first few days rather than treating it as something to get around to.

What happens if you do not comply

According to GOV.UK, you can be fined up to five hundred pounds if your dog or cat is not microchipped when required, or if it is not registered on an approved database. The same fine applies if the registered details are out of date.

GOV.UK also warns that only a specific list of government approved databases counts for legal purposes, and that emails from other services asking for payment to register a pet's chip may be scams rather than a genuine legal requirement. 

In practice, owners are usually given a set period to correct the problem before enforcement action follows, but the legal exposure exists from the point the animal should have been chipped, not from the point someone gets in touch to remind you.

A microchip does not replace a collar and tag

This is the part most owners miss. Long before microchipping existed, the Control of Dogs Order 1992 established a separate requirement: every dog in a highway or place of public resort must wear a collar with the owner's name and address on it, either inscribed on the collar itself or on an attached tag.

That legislation has never been repealed, and a microchip does not satisfy it. A dog can be fully chipped, correctly registered, and still be in breach of the law if it goes out for a walk without a collar and legible ID.

In practice, the two work at different moments: a collar and tag are what let a member of the public read your details and get in touch straight away, while a microchip is what a vet or shelter checks once a dog has already been picked up and needs formally confirming. If you are choosing a dog collar, it is worth treating the ID tag as a permanent fixture rather than something to add later, since the collar itself is the thing doing the legal work day to day.

Keeping everything up to date

The practical side of this is less about buying the right equipment once and more about maintenance. Update your pet's microchip database entry whenever you move house, change your number, or change ownership, and check the details periodically even if nothing has obviously changed, since database errors do happen.

A collar and tag need the same attention: engraving fades, buckles wear, and a growing puppy will outgrow a collar within weeks, not months, which is worth factoring in if you are buying from Bhooki's lead and collar range for a young dog rather than assuming one purchase will last.

None of this is complicated once it is laid out clearly, but the two-part structure of the law, a database entry plus a physical collar and tag, is genuinely easy to miss if you have only ever been told about the microchip. Both matter, and both are separately enforceable.