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Does a kitten need a health certificate to fly?

Legally it depends on the state, and for cats the answer is looser than most people assume. Practically you should have one anyway.

Two separate sets of rules apply here, and mixing them up is where breeders get into trouble.

The airline's rule and the state's rule are not the same rule

Some airlines don't require a health certificate for a cat flying in the cabin on a domestic flight. That's true, and it leads people to assume no paperwork is needed.

It's the wrong conclusion, but the right conclusion is more complicated than "you always need one." Moving an animal across state lines is governed by the destination state, not the airline. And states differ a lot, including between cats and dogs.

California and Texas don't require a Certificate of Veterinary Inspection for cats or dogs. Illinois and Michigan require one for dogs but not for cats. Where a CVI is required, the usual window is within ten days of travel, and it has to come from an accredited vet.

Then there's the clause that catches breeders specifically. Georgia, Maine and Montana require a CVI when the animal is being brought in for a change of ownership. A family moving house with their own cat doesn't need one. A kitten going from your cattery to a buyer does, because that's a change of ownership. The thing that triggers the requirement is the exact thing your business is.

Requirements also change, so check the specific destination with that state's department of agriculture before you book the vet, rather than assuming it's what it was last time.

What the certificate does not cover

A CVI isn't a vaccination record and it isn't a rabies certificate. Depending on where the kitten is going you may need all three, plus proof of age. Send the buyer copies of everything regardless of what's legally required. Their first vet visit will go much more smoothly, and it's the kind of thing that gets a cattery recommended.

Timing it around a young kitten

The ten-day window sits awkwardly against a vaccination schedule. A kitten that just had a booster isn't at its best, and you don't want the exam and the flight stacked on back-to-back days. In practice the comfortable pattern is: finish the vaccinations, give it a few days to settle, get the exam and the CVI, then travel three to six days later. Still inside the window, with room to move the flight once if weather forces it.

International takes months

Import permits, whatever the destination country requires, and in a lot of cases a rabies titer with a waiting period measured in months. If a buyer abroad wants a kitten, start that conversation several months before anyone picks a date.

The short version

• Don't assume a CVI is required, and don't assume it isn't. Check the destination state.
• The rules for cats are often looser than for dogs. Don't read a dog guide and apply it.
• A change of ownership can trigger a requirement that a house move wouldn't.
• Where one is required, ten days is the usual window. Count it backward from the flight.
• Book the vet appointment before anyone books a flight.
• Send the buyer the vaccination and rabies records too, required or not.