When and How Often Should You Deworm a Kitten?

Kittens are commonly dewormed from about 2-3 weeks of age and repeated every 2-3 weeks until roughly 12 weeks, then on a schedule your vet sets. The right product and amount depend on the kitten's weight and age, so use a vet-recommended kitten dewormer and never guess the dose.

Almost all kittens are born with or pick up intestinal worms, often from their mother's milk or the environment, which is why early, repeated deworming is standard care. This guide explains why kittens need repeated treatment, a typical schedule, the signs of worms, how to choose and give a dewormer safely, the other parasites that need different treatment, and how to protect your family. Budget for the vet visits with the vet cost estimator.

Why kittens need repeated deworming

Dewormers kill adult worms but not every developing stage, such as larvae migrating through tissues. Kittens can be infected in several ways:

• Through the mother's milk, which can carry roundworm and hookworm larvae.
• From the environment, such as contaminated soil, litter or feces.
• From fleas, which carry tapeworm larvae.
• From prey, in older kittens that hunt.

Repeating treatment every two weeks or so catches each new generation of worms as it matures, before it lays eggs. The mother cat should be treated as well, since she's often the source.

Common parasites in kittens

Protozoa such as coccidia and giardia aren't killed by standard dewormers, which is why a fecal exam matters.

Typical schedule (confirm with your vet)

Adult cats then follow an ongoing plan based on lifestyle (indoor or outdoor, hunting, exposure to other cats), often with yearly fecal tests.

Signs of worms

• Pot belly with a thin body
• Diarrhea or soft stool, sometimes with blood or mucus
• Vomiting (worms may be visible)
• Dull coat and poor growth
• Scooting or licking the rear
• Rice-like segments near the tail or in bedding (tapeworm)
• Coughing (larvae migrating through the lungs)
• Pale gums and lethargy (blood loss from hookworms or fleas)

Some kittens show no signs at all, so routine treatment is important.

Choosing and giving dewormer safely

• Use a product labeled for kittens and for their weight and age. Many are not safe for very young or tiny kittens.
• Never use dog dewormers or over-the-counter products without your vet's OK. Some ingredients are toxic to cats.
• Get an accurate weight on a kitchen scale before every dose.
• Follow the label or vet directions for dosing and timing.
• Ask for a fecal exam so the vet picks the right drug, since some parasites need a different treatment.
• Give with food if directed, and watch your kitten afterward for vomiting.
• Don't combine products unless your vet says so.

Doses aren't listed here because they depend on the product and your kitten's weight.

Worked example: staying on schedule

Sage was found at about 3 weeks old (approximately 400 g).

1. Week 3: vet exam, weight check and first deworming.
2. Weeks 5, 7, 9 and 11: repeat every two weeks as directed.
3. Week 8: fecal test at the first vaccine visit to check for coccidia and giardia.
4. From 12 weeks: monthly dewormer or a combined parasite preventive recommended by the vet.
5. At 6 months: vet switches her to an adult schedule.

Write each date in your phone calendar on day one so none is missed.

Flea control matters

Fleas cause tapeworms and can cause anemia in small kittens. Use only flea products labeled safe for your kitten's age and weight, and never use dog flea products on a cat. Ask your vet what to use.

Protecting your family

Some kitten worms, especially roundworms, can infect people, especially children. Wash hands after handling kittens or litter, scoop the litter daily, keep sandboxes covered, and keep kittens off kitchen counters.

When to call your vet

Call if your kitten has diarrhea, vomiting, bloody stool, weight loss, a swollen belly, lethargy or pale gums (possible anemia from hookworms or fleas), or if deworming doesn't seem to work. A very small kitten with diarrhea and lethargy needs urgent care.