The Pet Travel Scheme ("PETS") is a scheme which allows animals to travel easily between member countries without undergoing quarantine. A Pet Passport is a document that officially records information related to a specific animal, as part of that procedure. The effect is to drastically speed up and simplify travel with animals, and transport of animals, between member countries, compared to previous procedures, if the regulations are followed.

PETS was originally introduced for the benefit of animals entering or returning to the United Kingdom from other European Union countries, since historically the UK had very strong controls to safeguard against rabies including a compulsory 6 month quarantine period on imports of many animals. On October 1, 2001, several European Union countries introduced the PETS scheme, under which animals from any member country may freely travel (with the correct procedure) to any other member country on approved carriers. Over time the scheme has rolled out to other countries such as the United States, Canada, Australia and New Zealand.

The pet passport was originally suggested by the UK's Official Monster Raving Loony Party.