Taking a dog or a cat across an EU border is genuinely straightforward. Microchip, rabies vaccination, pet passport, go.
What catches people is never the list. It is the timing rules sitting underneath it, which are invisible until one of them has already gone wrong.
1. The microchip has to come first
The chip must be implanted before the rabies vaccination, and read at the appointment.
Get it the other way round and the vaccination does not count — not because the vaccine was bad, but because there is no way to prove it went into that animal. The fix is revaccinating, then waiting again. This mostly bites people whose dog was vaccinated young at a practice that chipped afterwards.
2. A booster one day late is not a booster
This is the one that ruins summers.
Keep the rabies vaccination continuously in date and boosters roll on with no waiting period. Let it lapse — by a single day — and the next injection is legally a primary vaccination, not a booster. That means the 21-day wait starts again before your pet may cross a border.
Nobody tells you this at the time. The vet gives the injection, the passport gets a new sticker, and everything looks normal. You find out three weeks before a holiday that you needed to have gone three weeks earlier.
The date that matters is the valid-until date in the passport, not the date of the last injection. Put it somewhere you will see it a month in advance.
3. Five destinations need a tapeworm treatment, on a clock
Dogs entering Finland, Ireland, Malta, Norway or Northern Ireland must be treated against the Echinococcus multilocularis tapeworm — by a vet, recorded in the passport, and given between 24 and 120 hours before you arrive.
Read that window again. Not "before you travel" — a specific bracket of one to five days. Too early is as invalid as not at all, which makes it the only pet travel requirement you can fail by being organised. Ferries and flights get missed over this, and it applies to dogs, not cats.
4. The airline's rules are stricter than the law
Meeting the EU requirements means the border will let your animal in. It says nothing about whether the aircraft will.
Carriers set their own conditions and they vary wildly: maximum weight including the carrier for the cabin, carrier dimensions to the centimetre, snub-nosed breeds refused outright, a limit of one or two animals per cabin on a first-come basis, and summer embargoes on hold travel in hot weather.
Book the animal on at the same moment you book yourself. Cabin places are capped per flight and go early, and finding out in August that the return leg has no space left is a genuinely awful problem to have.
5. Leaving the EU can cost you the way back
Travel between EU countries and this is irrelevant. Go outside and it matters enormously.
The EU keeps a list of non-EU countries whose pets are treated as low risk. Return from one of those and you carry on as normal. Return from a country not on that list, and your pet needs a rabies antibody blood test — taken at least 30 days after vaccination, analysed by an EU-designated laboratory — followed by a three-month wait before it may enter the EU.
Three months. There is no way to pay to shorten it.
The saving grace: a pet vaccinated and blood-tested inside the EU, with the result written into its passport, does not repeat this every trip. Which is a good argument for having the test done before a long trip somewhere unlisted, rather than discovering the rule from the wrong side of the border.
What to actually carry
- The pet passport, issued in an EU country by an authorised vet.
- The microchip number, somewhere other than the passport too.
- Proof of the tapeworm treatment, if you are going to one of the five.
- The airline's confirmation that the animal is booked.
Two smaller rules worth knowing: you may take up to five animals without it counting as commercial movement, and a puppy too young to be vaccinated — vaccination cannot happen before twelve weeks — generally cannot travel at all, whatever a breeder tells you.
Check before you book
The EU framework changed in April 2026, and individual countries add their own conditions. Use this to know which questions to ask, then confirm with your vet and the official guidance for your actual destination before booking anything you cannot change.
The part worth writing down
Every trap above is a date. Chip before vaccine. Twenty-one days. Valid-until. Twenty-four to one hundred and twenty hours. Three months.
None of it is difficult once written down, and all of it is invisible in a folder of vet receipts. We keep those dates in mypet care, and it will tell you before the booster expires rather than after — but a calendar reminder set for a month before the valid-until date prevents the expensive one just as well.
Set that one thing, if you set nothing else.
