Worming & deworming treatment for Australian dogs and cats
Worming sounds like a tedious admin job, and mostly it is, but it is also one of the cheapest pieces of pet healthcare you can do. Adult dogs and cats need it every 3 months. Puppies and kittens need it more often. The cost across a year is about $80 to $150 per pet. Below: which worms Australian pets actually catch, the schedule by age, what each product format covers, and the human-health side most blogs skip.
If your goal is just “tell me what to give and how often,” the short version: an all-in-one chew (such as Milbemax, Drontal Allwormer or Simparica TRIO) every 3 months, plus heartworm prevention if you live anywhere a mosquito can reach. The rest of this page is for the curious and the people whose dog has a half-eaten possum in the laundry.
The worms Australian pets actually catch
Four broad groups, with very different lifecycles and risks.
- Roundworm. Most common in puppies and kittens, transmitted from mum across the placenta and through milk. Can transfer to humans, particularly children playing in soil where pets toilet. Causes a pot-belly and dull coat in heavy infestations.
- Hookworm. Lives in the small intestine, drinks blood. Heavy infestations cause anaemia, particularly in puppies. Picked up from soil or by larvae penetrating skin (hence shoes around dog parks).
- Whipworm. Lives in the large intestine, eggs are extremely hardy in soil for years. Causes chronic intermittent diarrhoea that can be hard to diagnose without a faecal test. More common in adult dogs.
- Tapeworm. Picked up from fleas (the common one) or from raw meat / hunting (the more serious hydatid variety in regional Australia). Segments look like cucumber seeds in the poo or around the back end.
Heartworm sits in its own category, mosquito-borne, lives in the heart and pulmonary vessels, and is the one most worth a separate annual injection on top of quarterly worming. The puppy vaccination schedule covers when to start it.
The worming schedule by age
| Age | Frequency | What to use |
|---|---|---|
| 2 to 12 weeks | Every 2 weeks | Puppy/kitten-specific paste or syrup |
| 3 to 6 months | Monthly | All-in-one chew (split adult dose by weight) |
| 6 months and older | Every 3 months | All-in-one chew or tablet |
| Pregnant pets | At mating, before whelping/queening, and 2 weeks post-partum | Vet-prescribed (some products are unsafe in pregnancy) |
The first 12 weeks are the heaviest worming load any pet ever gets, because puppies and kittens are born with worms passed from mum. Skipping a fortnightly dose at this age is the single biggest reason puppies present at vets with diarrhoea and a pot-belly. The puppy vaccination schedule covers the rest of the early-weeks calendar.
Tablets vs spot-on vs injection
The product wars matter less than the consistency of using one. That said, the differences:
- Tablets / chews (Milbemax, Drontal, Simparica TRIO). The most complete, covers all four worm groups in one dose. Relies on the dog actually swallowing it. Some cats are surprisingly cooperative if the chew is meat-flavoured.
- Spot-ons (Advocate, Revolution Plus). Convenient, no swallowing, cover heartworm and most worms but commonly miss tapeworm. Useful for cats that refuse tablets.
- Annual injection (Proheart SR-12). One shot a year covers heartworm only. Doesn't cover intestinal worms, those still need quarterly tablets.
- Pastes / syrups (puppy/kitten only). The fortnightly approach for the first 12 weeks. Easier to dose by weight than splitting a chew.
Tell people when not to use a product like this: if your cat has had a permethrin reaction, never use a dog product. If your dog is on certain heart medications, talk to your vet before adding a multi-class wormer, ivermectin sensitivity in some Collies is real. For products that combine worming with flea and tick prevention, the flea, tick and parasite treatment guide covers which combinations are worth the extra cost.
Signs your pet has worms
- Visible worms or rice-grain segments in poo or around the back end
- Scooting on the carpet (often tapeworm)
- Pot belly with a dull coat in puppies or kittens
- Vomiting that produces a worm (rare but unmistakable)
- Persistent loose or bloody stool with no other obvious cause
- Weight loss in an otherwise normal appetite
Most well-wormed adult pets show no signs at all, that is the point. If you notice symptoms in a recently-wormed pet, see a vet, the wormer may not have covered the species you have, or there may be a non-parasitic cause. The cat vomiting guide covers the differential for cats.
What worming costs across a year
The human-health bit
This is the section most pet blogs skip. Some pet worms infect people, especially children. Roundworm larvae from contaminated soil cause visceral and ocular larva migrans, rare but serious. Hookworm larvae penetrate skin (the “creeping eruption” that sometimes turns up after beach holidays). Hydatid tapeworm, picked up by dogs eating raw offal in regional Australia, can form cysts in human organs that take decades to declare themselves.
None of this is panic territory in 2026 Australia. Worming the dog every 3 months and picking up after them within 48 hours sorts the public-health side. If you have toddlers and a dog, washing hands before meals matters more than people think.
Straight answers
How often should I worm my adult dog?
Every 3 months is the standard for adult dogs in Australia. Pets that hunt, eat raw food, or live with children may benefit from monthly. Daily-walked urban dogs can get away with quarterly without issue.
Can I see worms in my dog's poo?
Roundworms and tapeworm segments yes (the latter look like cucumber seeds or rice). Hookworm and whipworm are microscopic and only show on a faecal egg count at the vet. A clear poo doesn't mean clear of worms.
Are tablets, spot-ons or injections better?
Tablets cover all four worm groups in one go but rely on the dog actually swallowing them. Spot-ons miss tapeworm in most products. Injections (Proheart) cover heartworm for 12 months but don't cover intestinal worms. Most Australian vets recommend an all-in-one chew quarterly.
Can humans catch worms from pets?
Yes, particularly children with hookworm and roundworm via the soil where dogs toilet. Regular pet worming plus picking up the poo within 48 hours is the public health argument. Hydatid tapeworm is rare but serious in regional Australia.
Will worming make my dog sick?
Modern wormers cause mild side effects in less than 1 per cent of dogs (occasional vomiting or soft stool the day of dosing). If your dog has a heavy worm burden, the dying worms can cause a reaction, that's a sign worming was overdue.
Does my indoor cat need worming?
Yes, but less often. Indoor cats can still catch worms from fleas (tapeworm) and from raw food or hunting insects. Worming every 6 months is reasonable for a genuinely indoor-only cat.
Worming is the cheapest part of preventive pet care, and the part owners most easily forget because they rarely see the problem. A reminder on a phone calendar every 3 months is the simplest fix that exists. Information here is general and isn't a substitute for veterinary advice. Related: puppy vaccinations, cat vomiting, find a vet.