Photo: Unsplash (free licence).
Quick answer: a microchip only helps you get your pet back if the database details are up to date. Check with your vet or the relevant pet register that your current name, phone number and address are listed, and update them if you move, change number or the pet changes owner.
What it is and what it does
It is a small device the vet places under the skin, usually in the neck. It holds a unique number which, when read with a scanner, lets the register show who the animal belongs to.
Who must have one
In Spain, microchip identification is compulsory for dogs, cats and ferrets, with registration in the regional database. It is also required to travel with your pet within the EU.
How to check your details
- Find the microchip number in the vaccination record or passport.
- Ask your vet how to check the relevant register.
- Check name, phone number, address and email.
- Request a change if anything is out of date.
When to update them
- Moving house (especially to another region).
- New phone number or email.
- Change of owner (adoption, rehoming).
- Death of the animal.
As well as the microchip
An ID tag on the collar with your phone number lets anyone contact you without a scanner.
General information. Check the rules that apply where you live.

