Dog Deworming Schedule: How Often to Deworm a Dog
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Deworm puppies every two weeks from about 2 to 12 weeks of age, then monthly until around 6 months. Adult dogs are typically protected year-round with a monthly broad-spectrum preventive, or dewormed and fecal-tested at least twice yearly. Your vet tailors the plan to your dog.
Worms are one of the most common — and most preventable — health problems in dogs, and some can spread to people. The good news is that a simple, regular routine keeps them in check. Here is how often to deworm at each life stage, which worms matter, and how to know what your dog actually needs.
Puppy deworming: every two weeks
Many puppies are effectively born with worms, because roundworms and hookworms pass from the mother across the placenta or through her milk. A single treatment isn't enough — it clears the worms present now, but more mature as the days pass. That's why the standard plan treats repeatedly:
- Every 2 weeks from about 2 to 12 weeks of age (commonly at 2, 4, 6, 8, 10 and 12 weeks).
- Then monthly until around 6 months of age.
- Then onto an adult routine — usually a year-round monthly preventive.
Alongside deworming, the Companion Animal Parasite Council (CAPC) recommends puppies have a fecal (stool) test at least four times in their first year, starting at the first vet visit, so anything the dewormer misses is caught.
Adult dog deworming: monthly or twice-yearly
For adult dogs there are two common, vet-approved approaches, and many practices blend them:
- Year-round monthly prevention. Many monthly products (often the same chew or spot-on used for heartworm and/or fleas) include a broad-spectrum dewormer that keeps common intestinal worms controlled all year. This is the simplest way to stay protected.
- Periodic deworming with testing. If your dog isn't on a monthly product, vets typically recommend a fecal test and deworming at least twice a year — and more often for higher-risk dogs (hunting, boarding, dog parks, homes with young children).
CAPC advises testing adult dogs' stool at least two times a year, adjusting for health and lifestyle. Testing matters because whipworms and some others aren't covered by every product, and no schedule replaces knowing what's actually there.
Deworming schedule at a glance
A general reference. Products, exact intervals and which parasites to target are decided by your veterinarian.
| Life stage | Deworming frequency | Fecal testing |
|---|---|---|
| 2–12 weeks (puppy) | Every 2 weeks | At first visit; part of 4 tests in year one |
| 3–6 months | Monthly | Continue routine testing |
| 6+ months to adult | Year-round monthly preventive (or deworm ≥2×/year) | At least 2× per year |
| Pregnant / nursing dog | As advised — often alongside the litter | As advised by your vet |
| Higher-risk adult | Monthly, year-round | 2–4× per year |
Common worms in dogs
Four intestinal worms account for most infections, plus heartworm, which is a separate concern handled with its own preventive:
- Roundworms — very common in puppies; passed from the mother and from contaminated soil. Can infect people (zoonotic).
- Hookworms — attach to the gut and feed on blood, which can cause anaemia; also zoonotic and can be picked up through the skin.
- Whipworms — from soil contaminated with eggs; can cause bloody diarrhoea and are notoriously hardy in the environment.
- Tapeworms — usually caught by swallowing an infected flea or prey animal; you may spot rice-like segments near the tail. Good flea control helps prevent them.
Heartworm is not treated by a standard dewormer. It's spread by mosquitoes and prevented with a specific monthly medication — see our guide to heartworm prevention. Because tapeworms often ride in on fleas, pairing deworming with good flea and tick prevention makes both work better.
Keep deworming dates on track
Tavi remembers your dog's deworming and fecal-test cadence — every-two-weeks as a puppy, then monthly — and nudges you before each one is due. Free for your first pet.
Cutting your dog's worm risk
- Pick up and dispose of feces promptly — from your garden and on walks — to break the worm life cycle.
- Keep up year-round flea control, since fleas transmit tapeworm.
- Discourage eating wildlife, carrion or another animal's stool.
- Wash hands after handling soil or cleaning up, and keep children's sandpits covered — a simple guard against zoonotic worms.
- Bring a fresh stool sample to routine vet visits so testing is easy.
Frequently asked questions
How often should I deworm my dog?
Puppies are typically dewormed every two weeks from about 2 to 12 weeks of age, then monthly until around 6 months. Adult dogs are usually protected year-round with a monthly broad-spectrum parasite preventive, or dewormed and fecal-tested at least twice a year. Your vet sets the plan for your dog's risk.
Why do puppies need deworming so often?
Puppies commonly pick up roundworms and hookworms from their mother before birth or through her milk, so many are born with worms. Frequent early deworming clears repeated waves of parasites as they mature and reduces contamination of the environment. That is why every-two-weeks treatment is standard in the first months.
What worms do dogs commonly get?
The four common intestinal worms in dogs are roundworms, hookworms, whipworms and tapeworms. Roundworms and hookworms can also infect people, which is one reason routine deworming and prompt clean-up of feces matter. Heartworm is separate and is prevented with its own monthly medication, not a standard dewormer.
Do indoor dogs need deworming?
Yes, though the risk is lower. Even mostly-indoor dogs can be exposed through fleas, garden soil, other pets or hunting. Many veterinarians recommend year-round broad-spectrum parasite prevention for all dogs and at least one to two fecal tests a year. Your vet will tailor the frequency to your dog's lifestyle.
How do I know if my dog has worms?
Signs can include worms or rice-like segments in the stool or around the rear, diarrhoea, vomiting, a pot-bellied look in puppies, weight loss or a dull coat. Many infected dogs show no signs at all, which is why routine fecal testing and prevention matter more than waiting for symptoms.
Can I use an over-the-counter dewormer?
Some over-the-counter dewormers treat only certain worms and may not match what your dog has, and dosing is weight-based. It is safest to confirm the parasite with a fecal test and let your vet recommend the right product and dose, especially for puppies, pregnant dogs or unwell dogs.
Tavi's guides are informational and not a substitute for professional veterinary advice, diagnosis or treatment. Deworming products, doses and frequency depend on your dog's age, weight, health and local parasite risk — always follow your own veterinarian's plan, and when in doubt, contact your vet. Sources include the Companion Animal Parasite Council (CAPC), the American Kennel Club (AKC), PetMD, VCA Animal Hospitals and the Merck Veterinary Manual.