You can use an EU pet passport if:
They live in an EU country (e.g. Spain),
The pet is registered in that EU country
The passport is issued by an EU vet in that country
The details match the owner’s EU residence.
Information from the UK government website updated December 31. 2020.
The April 2026 update represents a consolidation of existing EU pet travel legislation rather than a change in requirements.
The official EU position and full legal framework can be found in the European Commission pet travel guidance.