Cats need four main categories of preventative care: core vaccinations, parasite prevention for heartworms, flea and tick control, and intestinal deworming. The specifics vary by age and lifestyle, but even indoor-only cats need most of these. Here’s what each one covers and when your cat should get it.
Core Vaccines Every Cat Needs
Four vaccines are considered core for all cats regardless of lifestyle: rabies, feline herpesvirus type 1, feline calicivirus, and feline panleukopenia virus. The last three are typically bundled into a single combination shot you’ll see referred to as FVRCP. Together, these protect against a fatal neurological disease (rabies), severe upper respiratory infections, and a highly contagious and often deadly intestinal virus (panleukopenia).
Kittens start their FVRCP series as early as 6 to 8 weeks old and receive boosters every 3 to 4 weeks until they’re 16 to 18 weeks old. Current guidelines recommend an additional dose at 6 months of age because up to one-third of kittens may not fully respond to the final kitten dose, sometimes due to lingering maternal antibodies that interfere with the vaccine. After that 6-month booster, cats get revaccinated 12 months later and then typically every 3 years for low-risk adults. High-risk cats, such as those who go outdoors or live with multiple cats, may need annual boosters.
Rabies vaccination follows a separate schedule set partly by local law. Most areas require an initial dose around 12 to 16 weeks of age, a booster one year later, and then revaccination every 1 to 3 years depending on the vaccine type used.
Feline Leukemia Vaccination
Feline leukemia virus (FeLV) vaccination is considered core for all kittens and cats under one year old because young cats are especially susceptible to this virus, which attacks the immune system and can lead to cancer. Kittens typically receive two doses, spaced 3 to 4 weeks apart.
For adult cats over one year, FeLV becomes a lifestyle-based vaccine. If your cat goes outdoors, lives with a FeLV-positive cat, or has regular contact with cats of unknown status, annual FeLV boosters are recommended. Low-risk indoor adults with no exposure to unfamiliar cats can generally skip it. Your vet will help you decide based on your cat’s specific situation.
Heartworm Prevention
There is no approved drug to treat heartworm disease in cats. That single fact makes prevention non-negotiable. Dogs have a reliable treatment protocol; cats do not. When a cat becomes infected, the options are limited to managing symptoms or risky surgical removal of the worms. Even the death of a single adult heartworm inside a cat can release enough toxins to cause fatal lung damage or sudden death.
Heartworm spreads exclusively through mosquito bites. Cats are less susceptible than dogs, but infections do happen, and they’re harder to detect. Many infected cats show no symptoms at all until the disease is advanced. When signs do appear, they usually involve the lungs: coughing, rapid breathing, and difficulty breathing. Some cats just become less active, lose weight, or vomit intermittently. These vague symptoms mean heartworm often goes undiagnosed.
Monthly preventatives, available as topical treatments or oral tablets, kill heartworm larvae before they mature. Year-round use is recommended because mosquitoes can enter your home through windows and doors even during cooler months. The American Heartworm Society recommends routine screening in cats to help establish a baseline, aid in diagnosing symptomatic cats, and assess heartworm risk in your area, though the testing process differs from dogs and uses both antigen and antibody blood tests.
Flea and Tick Control
Fleas are the most common external parasite cats encounter, and they bring problems beyond itching. Flea infestations can cause allergic skin reactions, transmit tapeworms, and in severe cases lead to anemia, especially in kittens. Ticks are a concern mainly for outdoor cats and can transmit several diseases.
Preventatives come in a few forms. Topical spot-on treatments are applied to the skin between the shoulder blades, typically once a month. Oral chew-style preventatives are also available for cats, with some lasting a full month per dose and newer options lasting up to 12 weeks. The active ingredients vary by product, and some are designed specifically for cats. Never use a dog flea product on a cat, as certain compounds safe for dogs (particularly permethrins) are toxic to cats.
Many cat owners combine flea prevention with heartworm prevention using a multi-spectrum product that covers both in a single monthly application. Some of these also treat certain intestinal parasites, which can simplify your cat’s preventative routine significantly.
Intestinal Parasite Control
Roundworms, hookworms, tapeworms, and single-celled parasites like coccidia and Giardia are all common in cats. Kittens are especially vulnerable because roundworms and hookworms can be passed from mother to kitten before or shortly after birth.
Kittens should be dewormed starting at around 2 weeks of age and then every 2 weeks until they reach 16 weeks old. This schedule uses a broad-spectrum dewormer effective against roundworms and hookworms. If coccidia is suspected or confirmed, a separate treatment is given, sometimes for 3 to 5 consecutive days depending on severity. Tapeworms require their own targeted medication and are most common in cats that have had fleas or that hunt rodents, since both are sources of tapeworm larvae.
Adult cats benefit from at least annual fecal testing to check for intestinal parasites, and many vets recommend deworming once or twice a year even without a positive test. Cats that go outdoors or hunt should be checked and treated more frequently. Some monthly heartworm or flea preventatives also contain dewormers that provide ongoing intestinal parasite control.
Why Indoor Cats Still Need Prevention
A common assumption is that cats who never go outside don’t need parasite prevention. That’s not accurate. Mosquitoes carrying heartworm larvae enter homes through open windows and doors. Fleas hitch rides indoors on your clothing, shoes, and furniture. Even potted plants brought inside can carry parasites or their eggs. Indoor cats that catch and eat the occasional mouse are at risk for tapeworms and other infections.
Vaccination needs are somewhat lower for strictly indoor cats. They’re less likely to encounter feline leukemia or respiratory viruses from unfamiliar cats. But core vaccines, particularly rabies and FVRCP, are still recommended because exposure can happen through escaped cats, new pets entering the home, or contact with wildlife that gets inside. Rabies vaccination is also legally required in most jurisdictions regardless of lifestyle.
Putting It All Together
For a typical kitten, the preventative schedule looks roughly like this: deworming every 2 weeks starting at 2 weeks old, first FVRCP vaccine around 6 to 8 weeks, FeLV vaccination starting around 8 weeks, continued FVRCP boosters every 3 to 4 weeks until 16 to 18 weeks, rabies vaccine around 12 to 16 weeks, a 6-month FVRCP booster, and monthly flea, tick, and heartworm prevention starting as early as the product label allows (often 8 weeks).
For adult cats, the ongoing routine simplifies to monthly parasite prevention year-round, annual wellness exams where your vet reassesses vaccine and parasite needs, FVRCP boosters every 1 to 3 years depending on risk level, rabies boosters per local law, and annual FeLV boosters only if your cat has potential exposure. Each cat’s plan should be tailored to their specific age, health, and lifestyle rather than following a one-size-fits-all protocol.