By Dr Duncan Houston
A vaccination reminder tells you that something is due. It does not explain why one cat needs a particular vaccine every year while another has a longer interval.
The right plan combines age, previous doses, likely exposure, the product used and local disease requirements. Indoor living lowers some risks, but it does not make vaccination irrelevant.
Quick Answer
Most cats need protection against panleukopenia, feline herpesvirus and calicivirus, usually given together as FVRCP. Rabies and feline leukaemia vaccination depend on location, age, exposure and applicable requirements. Kittens need a properly timed series, while adult boosters should follow an individual plan rather than automatically repeating every vaccine annually.
Which cat vaccines are core?
| Vaccine | Purpose | What changes the plan? |
|---|---|---|
| Panleukopenia, herpesvirus and calicivirus, often FVRCP | Protection against important intestinal/systemic and respiratory infections | Age, previous course, vaccine type and exposure |
| Rabies | Protection against a fatal infection affecting animals and people | Local disease status, legal rules, travel and product label |
| Feline leukaemia virus, FeLV | Reduces risk of progressive FeLV infection and associated disease | Young age, regional prevalence and contact with potentially infected cats |
The WSAVA vaccination guidelines treat FeLV as core for young cats and exposed adults in regions where infection is a concern. The terminology varies somewhat between guidelines, so the actual recommendation matters more than the label.
Vaccines do not provide identical protection. Herpesvirus and calicivirus vaccination primarily reduces disease severity and does not guarantee that a cat can never become infected or spread respiratory pathogens.
What does a kitten vaccination course involve?
For routine FVRCP vaccination, a common plan starts at approximately six to eight weeks and repeats at intervals of about three to four weeks, with the final kitten dose at 16 weeks or older. Higher-risk settings may need a different interval or continuation to around 20 weeks. Maternal antibodies can interfere with early doses, which is why the age of the final dose matters.
WSAVA also advises revaccination at or after about 26 weeks to reduce the gap for kittens whose earlier response was blocked. The WSAVA cat vaccination table summarises vaccine-specific schedules. Your vet should write down the dates for the products your kitten receives.
FeLV vaccination generally requires two initial doses separated by the product's specified interval, and testing is recommended before starting. Rabies timing follows local rules and the licensed product. Do not use an example kitten timetable as a substitute for the clinic's plan.
How often do adult cats need boosters?
After an appropriate initial course and follow-up dose, low-risk cats commonly receive suitable core boosters at longer intervals, often three years. Respiratory-disease exposure, product choice and health circumstances can change this. FeLV boosters depend on ongoing exposure and product recommendations.
UC Davis describes an individual approach to feline vaccination. A yearly health review remains valuable even in a year when no vaccine is due. Bring the actual record when changing clinics; an adult with uncertain history may need a catch-up course.
What about optional vaccines?
Chlamydia felis and Bordetella vaccines are considered for selected risk situations, rather than automatically for every multi-cat household or boarding cat. FIV vaccine availability and recommendations differ by country and can affect interpretation of some infection tests. FIP vaccination is not routinely recommended by major guidelines.
A vaccine is not treatment for an existing infection. Discuss exposure prevention, testing and appropriate separation if a household cat has FeLV or another contagious disease.
Are reactions normal?
| After vaccination | Interpretation | Action |
|---|---|---|
| Mild temporary sleepiness or tenderness, otherwise comfortable | A short-lived response can occur | Offer a quiet place and monitor; call if worsening or not settling over the next day or two |
| Persistent poor appetite, marked lethargy, repeated vomiting or painful swelling | Needs individual assessment | Contact the clinic promptly the same day |
| Breathing difficulty, collapse, facial swelling or rapid deterioration | Possible serious allergic reaction | Seek emergency care immediately |
When is this an emergency?
Breathing difficulty, collapse or rapidly progressing swelling after vaccination needs immediate veterinary care. Contact the vaccinating clinic or an emergency hospital and explain when the vaccine was given. Do not delay transport to try a human antihistamine.
What should you do about an injection-site lump?
Report a lump and monitor its size. The AAHA/AAFP feline guidelines use the 3-2-1 rule: investigate a lump that remains at three months, exceeds two centimetres or is enlarging one month after injection. These criteria are not instructions to wait if a lump is painful, growing quickly or otherwise concerning.
Most lumps are not cancer, but persistent masses deserve a planned diagnostic approach. Ask the clinic to record the vaccine and injection site accurately.
How to prepare a useful vaccination plan
- Bring dates, product records and any previous reaction details.
- Describe outdoor access, new cats, fostering, boarding and planned travel.
- Tell the vet about current illness, pregnancy or immune-suppressing treatment.
- Ask which vaccines are due, why and when the next dose is required.
- Keep the record and watch your cat after each visit.
Common mistakes
- Stopping a kitten course after one early injection.
- Assuming indoor cats have no infectious-disease exposure.
- Repeating every vaccine annually without reviewing risk.
- Using antibody titres as a replacement for every vaccine or legal requirement.
- Skipping future protection entirely after a previous reaction without discussing safer options.
Protection beyond vaccination
Limit contact with sick or unknown-status cats, maintain good hygiene and use gradual, planned introductions. Keep routine health checks and preventive care current. Vaccination is one part of reducing infection risk, alongside a safe environment and prompt attention to illness.
Frequently Asked Questions
Do indoor cats need vaccines?
Usually yes. Core protection remains important, while other vaccines depend on actual exposure and local requirements.
Can an adult cat restart vaccinations if records are missing?
Yes. Your vet can design a catch-up plan based on age, likely history, risk and product requirements.
Can titres replace cat boosters?
They can help assess protection for selected infections, especially panleukopenia. They do not answer every vaccination question or override legal requirements.
Should a sick cat be vaccinated?
Tell the vet before the visit. The decision to defer or proceed depends on the illness, exposure risk and vaccine.
Keep the plan specific and the record clear
The aim is reliable protection with an appropriate schedule. A brief yearly risk review and accurate records are more useful than treating every cat as though their circumstances are identical.
For practical information about preventive care, explore ASK A VET™ and confirm your cat's vaccination plan with the clinic providing their care.
The ASK A VET™ Tracker logs live location and activity trends, so a change in routine never goes unnoticed.
Every ASK A VET article is written and reviewed by qualified veterinarians.
