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Everyday prevention

Deworming dogs and puppies: when, why and what to check

AI-generated image of a young Sri Lankan veterinarian and owner discussing a health booklet beside a Labrador on a weighing scale

“When should I give my dog worm medicine?” is a useful question to bring to a check-up. Puppies and adult dogs do not necessarily need the same plan, and one medicine does not cover every parasite. Keep a record of the product and date rather than choosing a tablet by its colour or a neighbour’s advice.

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What research in Sri Lanka tells us

A study published in 2022 examined stool samples from 100 free-roaming dogs in tea-estate communities in Talawakelle. Hookworm was detected in 45 of those dogs. This was a specific community sample, not a national estimate or a measure of risk for your own pet. It shows why parasite control and careful disposal of dog stools matter locally.

When should puppies and adult dogs be treated?

International CAPC guidance starts puppy deworming at two weeks of age and repeats it every two weeks until regular broad-spectrum parasite control begins. This is a starting point for a veterinary plan, not an instruction to buy any product for a tiny puppy. Your vet should confirm the product, minimum age, current weight and local risks. Adult dogs need a plan based on their lifestyle and the medicine used; ask for the next due date in writing.

Check before giving a dose

  • Bring the packaging or a clear photograph of previous worm treatments, with dates and doses if known.
  • Have your dog weighed. Tell your vet if they are unwell, pregnant, nursing or taking other medicines.
  • Ask whether a stool examination is needed and how to collect a sample. Not seeing worms in stools does not prove your dog is parasite-free.
  • Use only the prescribed or recommended product and instructions. Do not repeat a dose early or combine products yourself.

Protect the home as well

Pick up dog stools promptly, wash hands afterwards, and keep children’s play areas free of animal faeces. Ask about flea control too, because some tapeworm infections involve fleas. Deworming does not prevent every future infection, so hygiene and follow-up remain important.

When to call the clinic

Diarrhoea, weight loss, poor growth or a swollen-looking belly can have several causes, including parasites. Arrange a veterinary assessment instead of repeatedly changing worm medicine. Pale gums, collapse, marked weakness, bloody stools or repeated vomiting need urgent advice, particularly in a puppy.

General education for dogs and cats; not a diagnosis or an individual treatment plan.

Sources and further reading
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