ISO microchip (11784/11785)
The identification transponder standard that EU and US border rules expect. The chip must be implanted BEFORE the rabies vaccination, or the vaccination does not count for travel.
The order matters more than the chip. Rules in the EU and the US expect an ISO 11784/11785 transponder, and both require it to be implanted before the rabies vaccination: if the dog was vaccinated first and chipped afterwards, that vaccination does not count for travel and has to be repeated after chipping. For the EU the rabies shot also has to be at least 21 days before the trip, so a chip put in late can delay a departure by at least three weeks.
Guides that use this term
Rules & paperwork
Bringing a dog into the United States: the CDC rules explained
Since August 2024 every dog entering the US needs to be 6 months old, microchipped and on the CDC Dog Import Form. High-risk countries add rabies steps.
Rules & paperwork
Entering the EU with your dog in 2026: passport, microchip and the 21-day rule
EU entry for dogs: ISO microchip, rabies shot 21 days before travel, pet passport or health certificate, and tapeworm treatment for 4 countries.