How do I keep my cat healthy?
A cat stays healthy on the core vaccines, parasite control suited to how it lives, a litter box you check every day and a yearly vet visit. Cats hide pain, so changes in eating, drinking, peeing or breathing are often the first sign of illness.
Updated November 8, 2026
What should I know about cats at a glance?
The domestic cat lives about 12 to 18 years and weighs 3 to 6 kg as an adult.
| Fact | Cats |
|---|---|
| Lifespan | About 12 to 18 years. |
| Adult weight | 3 to 6 kg. Large breeds such as the Maine Coon reach about 10 kg. |
| Lives in | Indoors, with a protected balcony or garden, or with free outdoor access, which raises the risk of FeLV, FIV, fights and accidents. |
| Social life | Solitary hunters by nature. Many live well with other cats when each has its own food, water, litter box and resting spot. |
| Vet | Once a year, and whenever something changes. |
What do vets see most in cats?
Dental disease, urinary disease, kidney disease in older cats and excess weight are among the most common reasons a cat sees the vet.
- Dental disease. Gum disease and tooth resorption hurt. They show as drooling, dropping food or chewing on one side.
- Urinary disease. Cystitis makes a cat pee often and in small amounts. In males the urethra can block, which is an emergency.
- Chronic kidney disease. Common in older cats: drinking and peeing more, weight loss. Vets follow kidney values, thyroid and blood pressure in seniors.
- Cat flu in kittens. Herpesvirus and calicivirus cause sneezing, runny eyes and mouth ulcers.
- FeLV and FIV. Viruses passed between cats, mostly by bites. FeLV is common in parts of Brazil, especially the Southeast and South.
- Sporotrichosis (Brazil). A fungal infection spread by scratches and bites that also infects people, epidemic in Brazil since the 1990s.
Which vaccines does a cat need?
WSAVA's 2024 guidelines say every cat needs the core vaccines against panleukopenia, herpesvirus and calicivirus, plus rabies where rabies is present or the law requires it. Where FeLV is common, its vaccine is also core for kittens under 1 year old and for adult cats that go outside or live with cats that do. Your vet sets the plan.
- Core. Panleukopenia, herpesvirus and calicivirus come in one vaccine, called V3, FVRCP, RCP or 3種 depending on the country.
- FeLV. Only cats that test negative should get it, so a FeLV test comes first.
- Non-core. Chlamydia (the extra part of V4) is mainly for multi-cat homes where it has caused disease. WSAVA does not recommend the FIP vaccine.
WSAVA's guidelines start kittens at 6 to 8 weeks, repeat every 2 to 4 weeks until 16 weeks or older, and add a dose at 26 weeks or older, because the mother's antibodies can block earlier doses. After that, a low-risk indoor cat needs core boosters no more than every 3 years, while cats that board or meet other cats may need herpesvirus and calicivirus yearly. The AAHA/AAFP guidelines for North America agree.
Both say never between the shoulder blades. WSAVA calls a spot low on a leg the gold standard, and AAHA/AAFP also accept the tail. Where vets inject varies by country, so ask your vet where each vaccine goes and to write the site on the card.
How do cat vaccines work where I live?
Vaccine names and rabies rules for cats change by country.
| Country | Names on the card | Rabies vaccine for cats |
|---|---|---|
| Brazil | V3, V4 (adds chlamydia), V5 (adds FeLV) | Required every year by state or city law in much of Brazil, such as the city of São Paulo, from 3 months of age |
| Portugal | Trivalente (RCP), leucemia felina | Voluntary for cats. Required to travel abroad |
| United States | FVRCP, FeLV | Required by state law in 34 states, according to AAHA, and by many counties and cities. Ask your vet what applies where you live |
| United Kingdom | Cat flu and enteritis (RCP), FeLV | Required to travel abroad |
| Mexico and Latin America | Triple felina (RCP), leucemia felina | Mexico offers it free to dogs and cats in yearly campaigns. Rules vary by state and country |
| Spain | Trivalente (RCP), RCPCh, leucemia felina | Set by each autonomous community. Voluntary for cats in 12 of the 17 autonomous communities |
| France | Typhus et coryza (TC), TCL with leucose | Required to travel abroad |
| Germany | Katzenseuche und Katzenschnupfen (RCP), FeLV | Required to travel abroad |
| Italy | Trivalente (RCP), FeLV | Required to travel abroad |
| Japan | 3種 (RCP), 4種 (RCP and FeLV), 5種 (RCPCh and FeLV) | Not required for cats. The law requires it for dogs |
How often does a cat need deworming and flea treatment?
ESCCAP's guidelines suggest deworming indoor cats 1 to 2 times a year, cats that go out or hunt 4 to 12 times a year, and at least 4 times a year when the risk is unclear. Your vet picks the products and timing.
- Kittens. ESCCAP suggests starting at 3 weeks and repeating every 2 weeks until weaning. CAPC, in North America, starts at 2 weeks.
- Year-round. CAPC recommends year-round protection against worms, fleas, ticks and heartworm for cats in the United States.
- Heartworm. The American Heartworm Society says that where dogs are infected, cats are at risk too, indoor cats included. In Brazil it is concentrated on the coast.
- Fleas. Fleas also spread tapeworm. Treat every pet in the home at the same time.
- Only products made for cats. Dog flea products with permethrin can kill cats, even through contact with a freshly treated dog.
Which signs in a cat can't wait?
Call your vet or an emergency clinic now if you see any of these.
- Straining with little or no urine. A cat straining with little or no urine may be blocked. This is an emergency, most common in male cats.
- Breathing with the mouth open. Cats rarely breathe with their mouth open. If yours does, call your vet now.
- Contact with lilies. Every part of a true lily or daylily, its pollen and the vase water can cause kidney failure in cats.
- Drooling, twitching or seizures after a flea treatment. This is how permethrin poisoning shows. If your cat lets you, wash the product off with warm water and diluted dish soap on the way.
- Collapse. Keep your cat warm and quiet on the way.
How do I care for a cat day to day?
A cat needs complete food made for cats, fresh water, a clean litter box, daily play and a place to hide. The habit that catches the most illness early is looking at the litter box every day: changes in how often, how much or where your cat pees are often the first sign of urinary or kidney disease.
- Food. Dog food is not complete for cats. Measure portions, since excess weight is common.
- Water and litter. The AAFP and ISFM guidelines ask for food, water and litter boxes in several separate spots. A common rule is one box per cat, plus one. Scoop daily.
- Teeth. Daily brushing with a cat toothpaste is the best prevention.
- Indoor life. Daily play that lets your cat chase and pounce, high places, scratching posts and a hiding spot.
How do I keep my cat's health record?
VetVitae, a pet health record app, keeps your cat's vaccination card, deworming and flea treatments and FIV and FeLV results, and reminds you 7 days before something is due and on the day.
It also tracks weight and vet visits. VetVitae is free on iPhone, Android and the web.
This guide is general information, not veterinary advice. Your vet knows your pet.
Questions
Does my indoor cat need vaccines?
Yes. WSAVA's guidelines say every cat should get the core vaccines against panleukopenia, herpesvirus and calicivirus, indoor cats included, because the panleukopenia virus can come in on shoes and clothes. After the kitten series, a low-risk indoor cat usually needs core boosters no more than every 3 years. Rabies depends on where you live, and your vet decides on FeLV from your cat's age and contact with other cats.
Should my cat get V4 or V5?
The difference is FeLV: V5 includes it and V4 does not. Where FeLV is common, which includes much of Brazil, WSAVA's guidelines treat its vaccine as core for kittens under 1 year old and for cats that go out or live with cats that go out. The chlamydia part, in both, is optional. A negative FeLV test is recommended before the first V5. Your vet can tell you which one fits your cat.
When should my cat be tested for FIV and FeLV?
The AAFP's 2020 guidelines recommend testing every cat when it joins your home, before the first FeLV vaccine, and when it is sick. A first positive FeLV result should be confirmed with a different test or a lab. Kittens can test positive for FIV from their mother's antibodies until about 6 months old, so a positive kitten is retested after that age.
My cat isn't peeing. When should I worry?
Right away. A cat that goes back to the litter box again and again and strains with little or no urine may be blocked, a true emergency that can be fatal without treatment, most often in male cats. Call your vet or an emergency clinic now. A cat that pees small amounts often, without straining, still needs a vet soon.
Can I use my dog's flea treatment on my cat?
No. Many dog flea products contain permethrin, which is extremely poisonous to cats and can cause drooling, twitching and seizures. Use only products made for cats, at the dose for your cat's weight. If a dog product touched your cat, wash it off with warm water and diluted dish soap and call your vet.
My cat has a lump where the vaccine went. Is that normal?
Sources
- 2024 guidelines for the vaccination of dogs and cats, WSAVA Vaccination Guidelines Group, 2024
- 2020 AAHA/AAFP feline vaccination guidelines, American Animal Hospital Association, 2020
- 2020 AAFP feline retrovirus testing and management guidelines, Journal of Feline Medicine and Surgery, 2020
- 2013 AAFP and ISFM feline environmental needs guidelines, American Association of Feline Practitioners, 2013
- GL1: Worm control in dogs and cats, ESCCAP
- General guidelines for dogs and cats, Companion Animal Parasite Council
- Current feline guidelines for the prevention, diagnosis and management of heartworm infection, American Heartworm Society, 2025
- Permethrin toxicity in cats, PDSA
- Lovely lilies and curious cats: a dangerous combination, US Food and Drug Administration
- Blocked cats: an emergency for male cats, University of Illinois College of Veterinary Medicine
- Dyspnea in cats, Cornell Feline Health Center
- Sporotrichosis in Brazil: a 50-year review, PubMed Central, 2022
- Esporotricose para profissionais de saúde, Ministério da Saúde, 2023
- Vacinação contra raiva animal em cães e gatos, Prefeitura de São Paulo
- Raiva, Direção-Geral de Alimentação e Veterinária (DGAV)
- Table of state rabies laws concerning cats, Animal Legal and Historical Center, Michigan State University, 2025
- Rabies resource, American Animal Hospital Association
- Taking your pet dog, cat or ferret abroad, GOV.UK
- Semana de reforzamiento de vacunación antirrábica canina y felina 2026, Secretaría de Salud de México, 2026
- Nota sobre las frecuencias de revacunación antirrábica de las comunidades autónomas, MAPA and AEMPS, 2026
- EU rules on travelling with pets, Your Europe, European Union
- Comment voyager avec son animal de compagnie, Ministère de l'Agriculture
- Leitlinie zur Impfung von Kleintieren, 6. Auflage, StIKo Vet, Tierärztliche Praxis Ausgabe K, 2025
- 狂犬病に関するQ&A, Ministry of Health, Labour and Welfare (Japan)
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