What information belongs on a microchip record?
A microchip record only needs to answer one question well — "who do I call, and about which animal?" — but most registries collect a bit more than the bare minimum, because the extra fields may matter in specific situations.
What's required versus optional?
Required, across nearly every registry: the owner's name, a phone number, an email address, and a mailing address, plus a description of the pet — species, breed, color, sex, and date of birth or approximate age. That combination is enough for a vet or shelter to confirm they've found the right pet and reach the right person. Optional, but commonly offered: an emergency contact (someone other than the owner to try if the owner can't be reached), a vet clinic's name and phone number, and any special needs of the pet.
Why does a registry need my address and not just a phone number?
A phone number can be enough on its own, but a mailing address adds a second, slower-but-reliable path to reach you if a call or text goes unanswered, and it's also used by some registries to route notifications to the right regional shelter network.
Should I list a vet or emergency contact?
It's worth it if you have one to list. Outdated contact information on the registration is one of the most common reasons why microchipped pets fail to go home.[1] Your address and phone number may have changed in the years since you created the registration. Having a vet clinic or emergency contact on file increases the chances of getting in contact with you in case your contact details are out of date or you are temporarily out of reach (traveling, etc).
What about medical or behavioral notes?
Some registries let you add free-text notes — allergies, medications, temperament warnings ("skittish around strangers," "needs a slip lead") — that aren't required but can matter a lot in the moment a pet is actually found. If a registry offers this field, it's worth filling in even if it's optional.
Keeping this information accurate matters as much as filling it in correctly the first time — see why keeping a record current matters for what happens when it drifts out of date.
Sources
- Characterization of animals with microchips entering animal shelters Lord LK, Ingwersen W, Gray JL, Wintz DJ. Journal of the American Veterinary Medical Association 235(2):160–167, 2009