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Puppy worming schedule: every 2 weeks, then monthly — here's why
Nearly all puppies carry intestinal worms — roundworms pass from mother to puppy before birth and through milk, no matter how clean the breeder or shelter. That's why deworming isn't an "if there's a problem" treatment; it's a default schedule: every two weeks until 12 weeks of age, then monthly until 6 months.
The schedule
| Age | Deworming | Notes |
|---|---|---|
| 2, 4, 6, 8, 10, 12 weeks | Dose every 2 weeks | Early doses are usually handled by the breeder or shelter — ask for the dates and product used |
| 3–6 months | Dose monthly | Often folded into a monthly heartworm preventive that also covers intestinal worms |
| 6+ months | Per your vet | Typically ongoing monthly broad-spectrum prevention plus periodic fecal exams |
Why so often?
Two reasons. First, dewormers kill the worms present in the gut on dosing day, but not migrating larvae elsewhere in the body — those keep arriving in the intestine for weeks, so single doses always leave survivors. Second, puppies constantly re-expose themselves: roundworm and hookworm eggs persist in soil, and puppies investigate the world mouth-first. Repeating every two weeks keeps clearing each new wave before the worms mature and shed eggs of their own.
What worms are we talking about?
- Roundworms — the big one for puppies; passed in the womb and through milk. Heavy loads cause pot bellies, dull coats, and poor growth. Also transmissible to humans, especially kids — one more reason schedules matter.
- Hookworms — blood-feeders that can cause serious anemia in small puppies; picked up from soil and through milk.
- Whipworms and tapeworms — covered by some but not all products; tapeworms usually arrive via swallowed fleas, so flea control is part of worm control.
Which product covers what is exactly the conversation to have at the first vet visit — bring the breeder's or shelter's deworming record so your vet knows what's already been given and when.
Fecal exams: the check on the system
Vets typically run a fecal exam at the first puppy visit and at least once more during the vaccine series — it confirms the dewormer is working and catches parasites (like whipworms, coccidia, or giardia) that standard puppy dewormers don't treat. A fresh stool sample in a sealed bag is the least glamorous thing you'll ever carry into a building, and one of the most useful.
The household side of worm control
Deworming the puppy is half the job; the environment is the other half. Pick up stool from the yard promptly — roundworm eggs need days in the environment to become infectious, so daily cleanup breaks the cycle. Wash hands after poop duty and before eating (and drill this into kids, who are the most likely humans to pick up roundworms), keep the puppy out of sandboxes, and stay on flea control, since swallowed fleas are how tapeworms arrive.
After 6 months: prevention mode
From six months on, most dogs move to a monthly broad-spectrum preventive — commonly the same chewable that prevents heartworm — plus fecal checks once or twice a year. Heartworm prevention itself typically starts by 8 weeks of age per your vet's recommendation, and unlike intestinal worms, heartworm disease is far easier to prevent than to treat.
Fit it into the bigger plan
Deworming rides along with the vaccine series: the 8-week dose lands at the first DHPP visit, the 12-week dose near the second. See the puppy vaccine schedule for how the visits stack, the puppy schedule by age for the master timeline, and the printable trackers to keep dose dates somewhere more reliable than memory.
Frequently asked questions
How often should I worm my puppy?
The standard vet-aligned schedule is every 2 weeks until 12 weeks of age, then monthly until 6 months. After that, most dogs move to ongoing monthly broad-spectrum prevention with periodic fecal exams.
Do puppies really have worms even if I can't see any?
Almost always, yes. Roundworms transfer from the mother before birth and through nursing, so vets assume puppies are infected and deworm on schedule. Visible worms in stool indicate a heavy load — absence of visible worms proves nothing.
Can I worm my puppy myself or do I need the vet?
Over-the-counter puppy dewormers exist, but products differ in which worms they cover and dosing is weight-based on a fast-growing animal. At minimum, have your vet confirm the product and schedule, and get fecal exams to verify it's working.
What are the signs of worms in puppies?
Pot-bellied appearance, diarrhea (sometimes with blood or mucus), visible rice- or spaghetti-like segments in stool, dull coat, poor weight gain, and scooting. But many infected puppies show nothing — which is why routine deworming exists.
A note from us: Always confirm timing with your veterinarian — schedules vary by region, breed, and health. PupSchedule is a planning tool, not a substitute for veterinary care.
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