PIO stands for Passport Issuing Organisation. These are Organisations mandated by the Department of the Environment, Food and Rural Affairs (Defra) to issue equine passports on their behalf. There are two types of PIO: 

ID Only Passports – These issue basic legal Identity papers that are required for any equine.

Studbook/Breed Society Passports - These contain the basic legal identification information held in ID Only Passports along with information on the lineage or family tree of the equine (In the passports these are referred to as Sire/Dam and Grand Sire/Grand Dam – which means parents and grandparents). These Passports are only available to equines who are part or pure breeds. Breed Societies will tell you if your equine is elidable to join.

Other related articles 

Why can an equine have more than one passport?

What should I do if the information in my equine/horse passport doesn’t match the National ChipChecker?

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This information is provided by Equine Register for the purposes of basic information sharing and guidance. However, any information provided cannot and must not be relied upon and independent opinion should be sought. 

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