ISO 11784/11785 microchip: why it must come before the rabies shot
An ISO 11784/11785 microchip is a rice-grain transponder placed under your pet's skin that holds a unique 15-digit number. It's the backbone of international pet travel: every certificate and vaccination is tied to that number. Crucially, the chip must be implanted before the rabies vaccination โ otherwise most countries won't accept the vaccine as valid.
Why 'chip first, then vaccinate'
Borders need to prove that the rabies shot belongs to this animal. If the chip went in after the vaccine, the timeline can't be verified, so the vaccination is treated as if it never happened โ and you'd have to vaccinate again and restart any waiting periods.
Make sure it can be read abroad
- Use an ISO 11784/11785 (FDX-B) chip โ the global standard. Some older US chips (125 kHz) aren't ISO and may not be read overseas.
- If your pet has a non-ISO chip, bring your own ISO-compatible scanner or implant an ISO chip as well.
- Have your vet scan the chip at every appointment and record the number on every document.
When to do it
Microchipping is the very first step โ before vaccines, titer tests and permits. If your pet is already chipped, confirm it's ISO and that the number matches all paperwork.
Run your route through the country pages to see every requirement in order.
- โ ISO 11784/11785 microchipping before rabies vaccine timeline
- โ Rabies titer blood test (RNATT) & mandatory 90-day waiting period
- โ Airport transit zone regulations, international vet certificates & EU pet passport
โ Your Checklist is Ready!
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FAQ
What if I vaccinated before microchipping?
Most countries will treat the rabies vaccination as invalid. You'll usually need to re-vaccinate after the chip and restart any waiting periods.
Are all microchips the same?
No. The international standard is ISO 11784/11785 (FDX-B). Non-ISO chips may not be readable abroad โ bring a compatible scanner or add an ISO chip.
Does microchipping hurt?
It's a quick injection similar to a vaccination and needs no anaesthetic for most pets.