The document sellers call a health certificate is, in most cases, a certificate of veterinary inspection, or CVI. A veterinarian examines the animal, finds no visible signs of infectious or contagious disease, and certifies that it meets the entry requirements of the state it is traveling to. It exists for moving animals across state lines, and its rules come from two places: USDA APHIS, which accredits the veterinarians allowed to sign one, and the destination state's animal health official, usually the state veterinarian, who decides what that state requires.
That origin tells you how to read one. A vet reading a CVI is not asking whether the animal is healthy in general. They are asking four narrower questions: does this document describe this animal, was the person who signed it allowed to, is it still current, and does it satisfy the state at the other end. Read it in that order.
1. Does it describe this animal?
Start with identification, because a perfect certificate for a different animal is worthless. Every CVI describes the animal individually: species, breed, sex, age or date of birth, color and markings, and at least one permanent identifier. For dogs, cats, and horses that is usually a microchip number. For livestock it is an official ear tag, and in some western states a brand. For registered animals it may include the registration number.
- Compare the microchip number on the certificate with the one in the listing's records, digit for digit.
- Ask the seller to scan the chip on a video call or at your visit, and read the number off the scanner yourself.
- Check sex, color, and markings against the animal, not against the photos.
- For a litter, make sure each animal has its own identifier. "Five puppies, black" identifies nobody.
2. Who signed it, and could they?
A CVI for interstate movement has to be issued by a veterinarian accredited through the USDA's National Veterinary Accreditation Program. The certificate carries the vet's name, their state license number, their national accreditation number, and a signature, on paper or electronic. Accreditation comes in two categories that matter here: Category I covers companion animals such as dogs and cats, while horses and livestock need a Category II veterinarian.
A missing accreditation number is the most common flaw on a certificate that was never official. So is a clinic name with no veterinarian named, or a signature from a vet who, when you look them up, is licensed in a different state from the clinic on the letterhead.
3. Is it still current?
A CVI is a snapshot. It records what one vet saw on one day, and it expires. Many states accept a certificate for 30 days from the inspection. Airlines commonly want one issued within 10 days of the flight. Some states and species run shorter windows still. The destination state's rule is the one that counts, so look it up before the seller books the exam, not after.
Check two dates, the inspection date and the issue date. Neither should be in the future, and neither should be older than the window. A certificate dated before the animal was old enough to travel was written for somebody else.
4. Does it satisfy the other end?
What the destination state requires shows up on the certificate as results: vaccinations, tests, and sometimes an entry permit number.
- Rabies. Most states require dogs, and many require cats, to be vaccinated against rabies once they are old enough. The CVI lists the vaccination date, the product, and how long it lasts.
- Coggins for horses. Nearly every state requires a negative test for equine infectious anemia before a horse crosses the line, usually drawn within the past 12 months and in some states within 6. The CVI records the lab, the accession number, the draw date, and the result.
- Livestock tests and permits. Cattle, goats, sheep, and pigs may need tuberculosis or brucellosis results, official identification, and an entry permit number the vet requests from the destination state before the move.
- Poultry. Birds often travel on NPIP certification instead of, or alongside, a CVI.
If a required result is missing, the certificate may still be genuine. It just will not get the animal across the line.
Paper, electronic, and copies
Many certificates are now issued electronically, through systems the states approve, and carry a unique certificate number. An electronic certificate is as official as a paper one, and often easier to check: ask the veterinarian's office to send the copy to you directly rather than through the seller. Whatever the format, the original, or the electronic copy, travels with the animal. Some states run agricultural inspection stations on major highways that stop horses and livestock to check their paperwork, and an airline will ask for it at the counter.
What a health certificate is not
A CVI is not a health history, a genetic test, a soundness exam, or a promise about next month. The vet certifies what was visible that day and nothing more. It does not tell you whether the parents were screened for heritable disease, whether a horse will stay sound in work, or whether a puppy carries parasites that were not yet showing. Those questions belong to other records: the breed's recommended tests, a pre-purchase exam, a fecal test. A seller who offers a health certificate as the answer to all of them is answering a different question from the one you asked.
Nor is it a breeder's own health statement. Many sellers write a one-page health promise or contract, and it can be useful, but it is the seller's word rather than a veterinarian's certificate. It should never carry an accreditation number, because it has none.
How it works on Everybarn
On Everybarn, a seller can add an interstate health certificate to a listing's Papers as its own document. Software reads it only to fill in the clinic's name and the date, which the seller checks before saving. The row then reads on file, with the upload date and the clinic's name, and signed-in buyers can open the certificate itself, with any phone numbers and email addresses on it blurred. Everybarn does not confirm the certificate with the clinic that issued it.
On file means the seller uploaded it, not that the clinic stands behind it. Reading it is your job, and now you know the order: the animal, the signer, the dates, the destination. If anything on it matters to your decision, contact the clinic yourself, using details you found independently. For the rest of a listing's records, see what Papers 5/5 actually means.