Microchipping Under EU Law
Microchipping of dogs, cats, and ferrets travelling between EU Member States is mandated by Regulation (EU) No 576/2013 on the non-commercial movement of pet animals. The regulation establishes a fundamental rule: the microchip must be implanted before the rabies vaccination. This sequencing is not arbitrary — the microchip provides the permanent, unique identifier that links the animal to its vaccination record. If a pet receives a rabies vaccine before being microchipped, that vaccination does not count for the purpose of EU travel, and the course must be repeated after microchipping.
The microchip number recorded in the EU Pet Passport — or, for travel from the UK, in the Animal Health Certificate — must exactly match the chip readable from the animal. Discrepancies can result in a pet being refused entry at a border crossing or placed in quarantine.
The ISO Standard: What 11784 and 11785 Mean
EU regulations specify that compliant microchips must conform to ISO standards 11784 and 11785. These two standards work together:
- ISO 11784 defines the structure of the code stored on the chip — a 15-digit number in which the first three digits represent the country code of manufacture (for example, 276 for Germany, 250 for France, 724 for Spain) and the remaining digits form the unique animal identifier.
- ISO 11785 defines the technical specification for how the transponder communicates — the radio frequency (134.2 kHz), the modulation method, and the data transmission protocol. This standard ensures that compliant chips can be read by compliant scanners regardless of manufacturer.
Together, these standards ensure interoperability across the EU and between countries participating in the international pet travel scheme. All scanners at EU border control posts must be capable of reading ISO 11784/11785 transponders.
Older microchips — particularly those using 125 kHz frequency, sometimes found in pets chipped before EU standards became widely adopted — may not be readable by standard ISO scanners. If you are unsure whether your pet's chip is ISO-compliant, ask your vet to verify this and note whether it is readable before you travel.
Country-Specific Microchipping Requirements Within the EU
While EU Regulation 576/2013 governs cross-border travel, individual EU Member States have their own domestic legislation on whether microchipping is compulsory for pets that never leave the country. Requirements vary considerably.
Germany
Germany does not have federal legislation making microchipping compulsory for all dogs, but individual Bundesländer (states) have the authority to impose their own rules. Several German states — including Hamburg and parts of Bavaria — have introduced compulsory microchipping regulations for dogs. Practicably, virtually all responsible breeders and rescue organisations in Germany microchip dogs as standard, and the German central pet registry (TASSO e.V. and FINDEFIX) is widely used. Cats are not subject to a nationwide microchipping requirement in Germany, though some municipalities have introduced local rules.
France
France has one of the more comprehensive domestic microchipping regimes in the EU. Under French law (Code rural et de la pêche maritime), the identification of dogs and cats is compulsory. Dogs born after 6 January 1999 and cats born after 1 January 2012 must be identified either by tattoo or by ISO-compliant microchip. In practice, microchipping has largely replaced tattooing as the preferred method. All identified animals must be registered in the national database (I-CAD — Identification des Carnivores Domestiques), which is managed by the Société Centrale Canine. Failure to identify a dog or cat can result in a fine and the animal being considered unowned.
Spain
Spain requires microchipping for dogs under Royal Decree 1084/2009 and subsequent regional legislation. Spain's seventeen autonomous communities each have their own animal protection laws, but all require dogs to be microchipped and registered. Most autonomous communities have extended this requirement to cats. Each community maintains its own regional registry, and there is a central IACMA national database that aggregates registrations. In Barcelona (and Catalonia more broadly), cats must be microchipped and registered under the Catalan Animal Protection Law. Unidentified animals found on the street may be legally considered abandoned and can be rehomed after a mandatory waiting period.
How Microchipping Works
A microchip is a passive radio frequency identification (RFID) transponder — it has no battery and emits no signal independently. It is encapsulated in biocompatible glass approximately the size of a grain of rice. The chip is implanted subcutaneously (beneath the skin) by a vet or trained professional using a sterile, pre-loaded needle. The standard implantation site for dogs and cats in the EU is the left side of the neck, just below the surface of the skin — though historically chips were placed between the shoulder blades and many older animals still have chips in this position.
When a handheld scanner is passed over the chip, it emits a low-frequency radio signal that powers the chip momentarily, causing it to transmit its unique 15-digit code. The entire process takes a fraction of a second and is painless. The procedure of implanting the chip takes only seconds, is no more painful than a standard vaccination injection, and does not require sedation or anaesthesia in most animals.
Finding a Lost Pet
Microchipping is only as useful as the database record attached to it. When a lost or stray animal is found, the finder or a rescue organisation will scan the animal for a chip. If a chip is found, the relevant national database is contacted to identify the owner. This system works only if:
- The chip is registered to the correct owner in the relevant national database
- The owner's contact details in the database are current
- The scanner used is compatible with the chip's frequency
Registration fees and procedures vary between countries — in some cases registration is included in the microchipping fee, in others it must be done separately by the owner via the national database website. In Germany, TASSO e.V. offers free registration. In France, I-CAD registration is mandatory and is handled by the implanting vet. In Spain, vets are required to submit registration details to the regional database at the time of implantation.
Keeping Your Details Updated
Moving house, changing phone number, or rehoming a pet all require an update to the microchip database — this does not happen automatically. Failure to update contact details is the most common reason microchipping fails to reunite lost pets with their owners. Contact the relevant national registry directly (TASSO or FINDEFIX in Germany, I-CAD in France, the relevant regional registry in Spain) to update your information. If you have rehomed your pet, both the previous and new owners typically need to be involved in the transfer of registration.
If you are unsure which database your pet's chip is registered with — particularly if you have moved from another country — your vet can help trace the registration through international lookup services such as PetMaxx or the European Pet Network.