Before we start: This is general information about the science of titre testing, not veterinary or business advice. Anything to do with a specific dog is a conversation for a vet. What you accept at your door is a policy call for you, your insurer and your own read on risk. Whether you accept titre testing is entirely your decision.
This one keeps coming up in the daycare and boarding owner groups, and it's a fair question: do you accept a dog with a positive titre test if it genuinely can't be vaccinated, and how do you feel about titres when it's simply the owner's choice not to vaccinate?
We ran Hound Health in Bondi before we built Petboost, so we've sat with this ourselves. Generally, from what we've seen speaking to fellow business owners, the confusion almost always comes from folding two very different questions into one. There's the science question, which is fairly settled and worth understanding properly. Then there's the policy question, which every business answers differently and is entitled to. Let's pull them apart.
What a titre test actually measures
A titre test is a blood test that checks whether a dog is carrying antibodies to a disease, and roughly how many. For dogs it's usually run against the core diseases: parvovirus, distemper and adenovirus (canine hepatitis).
Strip everything else away and it answers one narrow question: does this dog still have the antibodies, or not?
For the core diseases, a positive titre is generally accepted as strong evidence that a dog has protective immunity at the time of the test. The research on this is pretty consistent. Dogs with a measurable titre are very unlikely to develop clinical disease if they're exposed, even years after their last vaccination. It's also why the WSAVA vaccination guidelines (the World Small Animal Veterinary Association, whose guidelines a lot of vets work to) recognise titre testing as a valid way to check core immunity rather than revaccinating on a fixed calendar.
A titre and a vaccination certificate answer different questions
This is the part that most often gets missed, so it's worth being precise about.
A vaccination certificate records what was given, and when. A titre measures whether immunity is actually present right now. One is the method, the other is the result.
Put bluntly: the certificate tells you what went in, the titre tells you what's actually there.
That distinction has a real consequence. A small number of dogs are non-responders, meaning they were vaccinated but never mounted a proper immune response. On paper they look covered. In reality they may have less protection than an unvaccinated dog sitting on a strong positive titre. So a current positive core titre is arguably a more direct measure of protection than a certificate of unknown effectiveness.
What a titre doesn't tell you
None of that makes a titre a magic pass, and being honest about the limits is what keeps you on solid ground.
- It only covers what you test for. A core titre says nothing about the non-core diseases, and most importantly it doesn't replace anything for kennel cough. That's not something a standard core titre measures.
- It measures antibody, not the whole immune picture. A titre reads the antibodies in the blood, not the cell-mediated immunity or immune memory sitting behind them. That's part of why the Australian Veterinary Association still frames vaccination as an individual clinical decision, and why a negative titre in a previously vaccinated dog doesn't automatically mean unprotected.
- It's a snapshot, not a forecast. A positive titre reflects immunity on the day of the test. Core immunity does tend to be long lasting, but the result speaks to now, not five years down the track.
- The lab and the interpretation matter. Where the test was run, and how the result is read, both affect how much weight it deserves.
- Protection isn't the same as never catching it. A positive titre means a dog is very likely protected from getting sick. It doesn't guarantee the dog can never pick up an infection or briefly shed something.
Where the science stops and your policy starts
Here's the honest bit. The antibody science is identical whether a dog is unvaccinated for a genuine medical reason or because the owner simply chose not to vaccinate. The blood doesn't know the difference, and a positive core titre means the same thing in both cases.
What changes between those two situations isn't the science. It's everything around it: your insurer's position, your council or state requirements, what your other clients expect, your liability if something goes wrong, and your own comfort level. Those are business and risk questions, and a titre result can't answer any of them for you.
Generally, from what we've seen speaking to fellow business owners, there's a real spread of approaches here, and all of them are defensible:
- Some accept a current positive core titre plus a supporting vet certificate, and treat it the same as full vaccination.
- Some accept titres only where a vet has certified the dog genuinely can't be vaccinated for medical reasons.
- Some require full vaccination across the board, medical exemptions aside, and keep it simple.
- Some are comfortable accepting titres regardless of the reason, on the science alone.
There's no single right answer in that list. It's genuinely a personal preference for each business, and it's completely reasonable to land somewhere different from the daycare down the road. What matters more than which option you pick is that you decide it deliberately, write it into your entry requirements, and apply it consistently to every dog, rather than making the call at the door with an anxious owner in front of you.
Making your policy workable day to day
Whatever you land on, the practical side is the same: get the record before the dog arrives, keep it somewhere your team can actually see it, and know when it lapses.
That's largely what we built the vaccination side of Petboost to handle. You can store vaccination or titre records on each pet's profile with their expiry, make current records an eligibility requirement for online booking so ineligible dogs can't book in the first place, and collect the certificate up front through the pet owner's portal or at check-in. Expiring records then surface as alerts on the appointment card before the pet turns up, so nothing gets discovered at the grooming table or the play-yard gate.
None of that decides your policy for you. It just makes whatever you've decided easy to run.
The bottom line
On the pure science, the question really is as simple as "does this dog still have the antibodies or not," and for the core diseases a documented positive titre answers that pretty confidently. It's a direct measure of immunity, and in some ways a more honest one than a certificate.
Everything after that, especially the difference between a medical exemption and an owner's personal choice, is a policy decision rather than a scientific one. That part is yours to make. Talk to your vet about the dog, talk to your insurer about the risk, then set a clear requirement and hold the line on it.
Sources and further reading
If you want to read the underlying guidance rather than take our word for it, these are the sources this article draws on:
- WSAVA Guidelines for the Vaccination of Dogs and Cats. The World Small Animal Veterinary Association guidelines, which recognise serological (titre) testing for the core diseases as a valid alternative to revaccinating on a fixed calendar.
- Australian Veterinary Association: Vaccination of dogs and cats. The AVA's position, which supports individualised vaccination decisions made through the vet, client and patient relationship, and notes that a titre measures antibody rather than the full immune picture.
- Vetnostics: Vaccination and antibody titre testing in dogs. An Australian veterinary pathology explainer on what a positive or negative core titre actually means.
- Walkerville Vet: Titre Tests and Dog Vaccination. A plain-English Australian vet write-up covering the same core-only caveats.
- PetProfessional: The pros and cons of titre testing. An Australian pet-industry look at titres from a facility's point of view.
Guideline positions and links verified July 2026. This is general information, not veterinary advice. Always confirm the current guidance with your own vet for a specific dog.
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