also called ISO 11784 microchip · pet microchip · transponder chip
An implanted animal identification chip that meets the common international standard so border scanners can read the number.
An ISO microchip is an implanted animal ID chip that meets the common international standard, so border scanners can read the number. If your pet's chip does not meet that standard, a scanner at your destination may not read it, forcing you to carry your own scanner or have the animal re-chipped. And if a certificate lists a number that does not match the chip, officials treat it as belonging to a different animal entirely.
You arrive at a border with your dog and its paperwork, but the chip was a non-standard type the local scanner cannot read. Suddenly the documents cannot be matched to the animal in front of them, and your smooth crossing turns into a problem you have to solve on the spot.
Non-standard chips may be unreadable at destination, forcing you to carry a scanner or re-chip. Certificates that do not match the chip number are treated as belonging to a different animal.
The difference is the whole point, so here is each one in a line.
These cover clearing health checks in order to travel.
An Animal Health Certificate is a single-trip vet certificate that a pet meets a destination's entry rules, a pet passport is the reusable booklet recording its microchip and vaccinations, and an ISO microchip is the internationally readable chip both rely on.
A fit to fly certificate is a clinician's letter clearing a person or pet for a flight, and a yellow fever certificate proves a specific vaccination some countries demand on entry.
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