Cat Microchip Law UK: What Every Cat Owner Must Know
As of 10 June 2024, it became a legal requirement for all cats in England to be microchipped by the age of 20 weeks. Owners who fail to comply face a fine of up to Β£500.
Wales introduced a similar requirement in 2023. Scotland and Northern Ireland are expected to follow, though their timelines differ.
What the law requires
Under the Microchipping of Cats and Dogs (England) Regulations 2023, every cat kept in England must:
- Be microchipped by the age of 20 weeks
- Have their chip registered on an approved database (such as Petlog, Microchip Central, or PetIdentity)
- Have the owner’s contact details kept up to date on that database
The chip itself is only useful if the registration details are current. A chip registered to a previous owner β or with an old phone number β cannot be used to contact you.
How microchipping works
A microchip is a small device about the size of a grain of rice, implanted under the skin at the back of the neck by a vet or trained implanter. It contains a unique 15-digit number that can be read by a scanner β the kind used by vets and rescue centres.
The chip itself is passive: it stores only that number. When a found cat is brought to a vet or rescue, the staff scan the chip, look up the number on a database, and find the owner’s details.
The critical limitation: microchips require a scanner
This is the gap that catches many owners out. A microchip is invisible to the public. If someone finds your cat in the street, they cannot read the chip themselves β they need a specialist scanner, which means taking the cat to a vet or rescue centre.
That’s a significant barrier. Many finders, especially if they’re already caring for a friendly cat that turned up on their doorstep, may not immediately think to make a vet trip. And if they do, it may be days before the call reaches you.
Why a collar tag still matters
A collar tag with your phone number is the fastest route home for your cat. Unlike a microchip, it can be read immediately by anyone β no scanner, no vet trip, no delay.
Critics of cat collars worry about safety β breakaway collars address this, releasing under pressure so a cat can’t get snagged. Modern breakaway designs are safe enough that most vets now recommend them.
Smart tags: what they add
A smart NFC + QR collar tag goes further than a traditional engraved tag. When tapped or scanned by a smartphone, it shows:
- Your cat’s photo and name
- Your contact details β with one-tap calling
- Any medical information (important if your cat is on medication)
- A lost mode that switches the profile to an emergency page if your cat goes missing
The microchip and the smart tag serve different purposes and work together: the chip is for vets and rescues, the tag is for the person who finds your cat at the end of their street on a Tuesday evening.
What to do if your cat isn’t chipped yet
Book an appointment with your vet. Microchipping typically costs Β£10β30 and takes a few minutes. After the procedure, make sure you complete the registration with a UK-approved database and save your login details somewhere safe β you’ll need them if you ever move house or change your phone number.
