Titer tests instead of vaccines: what to accept at the counter

What a titer is

A titer is a blood test measuring the antibody an animal carries against one disease on the day the sample was drawn. For rabies the tests are the RFFIT and the FAVN, reported in IU/mL; 0.5 IU/mL or more is the threshold most import and travel rules use. For distemper, parvovirus and adenovirus, laboratories report a numeric titer and usually a plain reading: protective or not.

The report names the animal, the sample date, the test, the result, the laboratory and normally the veterinarian. What it is not is a vaccination. It says what the antibody level was on one date, promises nothing about next month, and is not the act a rabies statute describes.

What has no titer at all

Bordetella — kennel cough. No accepted blood test tells you a dog is protected against it: the protection is largely in the airway, not the bloodstream, and “kennel cough” is several organisms at once. The same is true in practice for leptospirosis and canine influenza. A request for a titer instead of bordetella therefore has no test behind it. It is a request to waive the requirement, and belongs under your exemption rule, not your titer rule.

Rabies: the certificate is what the law wants

In most US jurisdictions the rabies statute requires vaccination and a certificate; a titer is not a legal substitute for either. When a dog bites or is bitten, animal control asks whether it is currently vaccinated, and a titer on its own does not answer that. Under the NASPHV protocol most states follow, a titer can only support the case that a dog whose paperwork has lapsed was vaccinated before: it takes paired samples showing a significant rise with the second above 0.5 IU/mL, and even then it is the rabies control authority that decides whether the dog gets a 45-day observation instead of strict quarantine [NASPHV, Prospective Serologic Monitoring (2016) — verified September 6, 2026]. A dog that was never vaccinated does not qualify for that route at all. Some states let a veterinarian certify a medical exemption. That makes the dog exempt, which is not the same as vaccinated, and an exposed exempt dog may still face quarantine. At least one state’s facility rule says it outright: Iowa’s kennel regulation states that vaccine titers are not accepted as verification [Iowa Admin. Code r. 21—67.7(1); definitions at r. 21—67.1; day care at r. 21—67.8(2) — verified August 31, 2026].

Canada differs by province. Ontario’s rabies regulation, for example, treats a veterinarian’s statement of exemption as the alternative to the certificate — a document, not a test result [R.R.O. 1990, Reg. 567 (Rabies Immunization) under the Health Protection and Promotion Act, as amended July 1, 2023; College of Veterinarians of Ontario rabies standard — verified September 2, 2026]. The counter rule in either country: for rabies, a titer is extra information beside a certificate or a written exemption, never a replacement. Check your own state or province.

The medical-exemption letter, and why you need a written rule

The pattern is consistent: a letter on the clinic’s letterhead, signed by the veterinarian, naming the animal, stating that vaccination against a named disease is medically inadvisable, and dated — usually good for a year. It often arrives with a titer for the core vaccines. Facility rules in some states contemplate exactly this document: Colorado’s allow a veterinarian to exempt an animal in writing where the vaccine would endanger its life [PACFA rules, 8 CCR 1202-15, § 19.5.3 (eff. July 15, 2025) — verified August 31, 2026], and Illinois’s let a kennel accept a dog without distemper vaccination where the owner’s veterinarian recommends an exemption in writing [8 Ill. Adm. Code § 25.120(b); licence classes under 225 ILCS 605/3(a) — verified August 31, 2026].

Your shop needs its own rule, written down, because this comes up rarely, always with a frail dog and an owner who has had the argument before, and a decision made on the spot cannot be defended later. It should say which requirements a titer plus a letter can meet (typically distemper and parvovirus), which it cannot (rabies, bordetella), how recent the titer must be — many shops say within twelve months — and whether an exempt dog joins group play at all. Ask your insurer before you publish it; some policies condition cover on every animal being currently vaccinated.

Recording a titer so the reminders still work

A titer has no expiry in the certificate sense, which is why it so often ends up in a system as a fake vaccination with a made-up date. Record it as what it is: the disease, the sample date, the result, the laboratory, the veterinarian, the report itself, and the date your policy says you will ask again. Label it a titer everywhere it appears, or next year’s report will say “vaccinated” about a dog that was not.

VaxCheck stores a titer as its own kind of record, flagged as a titer rather than a dose, with the date the report gives and the date the result is valid until, so the owner’s reminder still goes out and every list and report reads “titer” beside it.

What to say at the counter

“Thanks for bringing this in. This is a titer — a blood test — rather than a vaccination certificate. For distemper and parvo we can accept it with a short note from your vet, and it counts for twelve months from the test date. For rabies we need the certificate or a written exemption from your vet, because that is what animal control asks us for if anything ever happens. I’ll photograph this so it is on Cooper’s file either way, and I can email your vet from here for the note if that helps.”

Same words from every member of staff. Owners accept an answer they do not like when it is the same answer for every dog in the room.

Put the rule where the record is

A titer policy only works if the record still says “titer” when the dog comes back next year and the person at the counter is someone else.