Why microchipping matters more than you might think

Every year, thousands of pets across the UK go missing. A gate left open, a window nudged ajar, a loud bang on Bonfire Night, a cat who simply wanders further than usual. In those first few hours, the difference between a pet coming home and never being seen again often comes down to one tiny piece of technology the size of a grain of rice.

A microchip is a permanent form of identification implanted under your pet's skin. It carries a unique number that can be read by a scanner at any vet practice, rehoming centre or dog warden's office. That number links to your contact details on a database, which is how a stranger who finds your pet can get them back to you quickly.

Collars and tags are important, and the law requires dogs to wear them in public. But they fall off, get caught on fences, and are occasionally removed by well-meaning passers-by. A microchip cannot be lost.

How a microchip actually works

It helps to be clear about what a microchip is and what it is not, because misconceptions cause real problems.

• It is not a tracker. A microchip does not transmit a location. It has no battery and no moving parts. If your pet is missing, the chip only helps once somebody scans it.
• It contains one piece of information: a 15-digit number. That number is meaningless until it is matched to a record on a database containing your name, address and phone numbers.
• It is inserted between the shoulder blades with a sterile needle, normally without anaesthetic. It takes a few seconds and most pets barely react.
• It lasts a lifetime. There is nothing to recharge, replace or maintain.

The chip itself is reliable. The weak point is almost always the registration record attached to it.

What the law says

In England, Scotland and Wales, all dogs must be microchipped by the time they are eight weeks old, and the breeder or keeper must be recorded as the first registered keeper. In England, cats must also be microchipped, with similar rules introduced or planned across the rest of the UK.

Beyond the legal requirement, there is a practical benefit that is easy to overlook. If your dog ends up in council custody, a chip means you can be contacted straight away instead of your pet spending days in kennels while you search. For cats, who are far less likely to wear a collar, a chip is often the only way home.

Getting it done: what to expect

Most veterinary practices will microchip your pet during a routine appointment. It is a good idea to combine it with a vaccination visit or a health check, particularly for a kitten or puppy.

• Cost: typically between £20 and £40, though some charities and council-run schemes offer it free or at a reduced rate during awareness campaigns.
• Before you leave, ask the vet to scan the chip while you are still in the room. You want to see the number appear and confirm it matches the paperwork you are given.
• Record the details straight away in your phone and on paper: the chip number, the database your pet is registered with, and the login information they send you.
• Ask for a scan at every annual check-up. Very occasionally a chip can migrate or fail to read, and it is better to discover that in a consulting room than on a busy road.

Keep your contact details up to date

This is the single most common reason microchips fail to reunite pets with owners. A chip registered to a phone number you had three years ago, or an address you moved out of, is almost as much use as no chip at all.

Update your record whenever anything changes:

• You move house, or your postcode changes.
• You change your mobile number or email address.
• Your pet is rehomed, sold or goes to live with somebody else.
• Your pet dies, so the database is not contacting you years later about a cat who passed away.

If you adopted from a rescue, check who is named on the chip. In many cases the animal is still registered to the charity, and you will need to transfer the registration into your own name, sometimes for a small fee. Do this in the first week, not the first emergency.

If your pet goes missing

Act quickly and in parallel, rather than in sequence.

• Report your pet as missing to the database your chip is registered with, so anyone who scans them is told to call you.
• Ring local vet practices, rehoming centres and your council's dog warden, and give them the chip number.
• Post clear photographs and your contact details in local community groups and on noticeboards within a few miles of home, since cats and dogs rarely travel far.
• Put up paper posters. Not everyone is online, and the person who finds your pet may be one of them.

Microchipping is not glamorous, and it will probably never be the most exciting thing you do for your pet. But it is cheap, quick, permanent and, on the worst day of your pet-owning life, it may be the thing that brings them back through your front door.