A healthy pet starts from the inside out. Photo: Unsplash
Worms aren't the most glamorous topic — but they're one of the most important health issues for Australian pets. Most dogs and cats will encounter intestinal parasites at some point, and some of those parasites can affect your family too.
The good news is that preventing worms is straightforward once you understand what you're dealing with. Here's what you need to know.
What's Actually Living in There?
Australian pets face several common intestinal parasites. Here's the lineup:
Almost all puppies are born with roundworms — they're transmitted across the placenta before birth. That's why worming starts as early as two weeks of age.
What's Inside Your Pet's Dewormer?
Not all dewormers target the same parasites, and they work in very different ways. Here's a quick breakdown of the main active ingredients you'll find in Australian products:
Different active ingredients target different parasites — knowing what's inside helps you choose. Photo: Unsplash
Praziquantel — the tapeworm specialist. Causes the worm's outer layer to become permeable to calcium, leading to paralysis and disintegration. It's the only widely available drug that kills all tapeworm species, including the hydatid tapeworm.
Pyrantel — targets roundworms and hookworms by paralysing them. One of the safest dewormers available — it barely absorbs into the bloodstream and acts right in the gut. Safe enough for puppies from two weeks old.
Fenbendazole / Febantel — a benzimidazole that disrupts the worm's energy metabolism. Broad-spectrum coverage including roundworms, hookworms, whipworms, and some tapeworms. Also the go-to treatment for Giardia (off-label, 3–5 day course under vet direction).
Milbemycin oxime — a macrocyclic lactone that causes nerve paralysis in parasites. Covers roundworms, hookworms, whipworms, and prevents heartworm. Often combined with praziquantel for full intestinal coverage.
Moxidectin — similar class to milbemycin but sticks around longer in the body. Found in Advocate (spot-on) and ProHeart (12-month heartworm injection).
Comparing Popular Australian Products
This is where it gets confusing — there are dozens of products on the shelf. Here's what the most common ones actually cover:
💡 Key Takeaway: Many popular all-in-one products (NexGard Spectra, Simparica Trio, Advocate) do not cover tapeworms. If your pet is on one of these, you still need a praziquantel-containing wormer — like Drontal — every three months for complete protection.
Puppy & Kitten Worming Schedule
Young animals need more frequent treatment because they're the most vulnerable. Here's the standard Australian schedule:
Almost all puppies are born with roundworms — early worming is essential. Photo: Unsplash
Puppies
Kittens
Kittens start a bit later (6 weeks) since cats don't pass roundworms through the placenta — only through milk. Same principle: frequent early treatment, transitioning to a quarterly adult schedule from 6 months.
Adult Maintenance — How Often Is Enough?
The Australian Veterinary Association recommends a minimum of quarterly intestinal worming for adult dogs and cats using a complete allwormer.
If you're using a monthly product that includes heartworm prevention (Milbemax, NexGard Spectra, Simparica Trio, Advocate), you're getting continuous intestinal worm coverage as a bonus. But remember to check whether tapeworms are covered — if not, add a quarterly praziquantel dose.
When to Worm More Often
Some pets need extra attention:
- Hunting or scavenging dogs — eating prey means more tapeworm and roundworm exposure
- Dogs on farms or around livestock — hydatid tapeworm risk. These dogs should receive praziquantel every 6 weeks, not just quarterly. This is an Australian public health requirement in hydatid-endemic areas.
- Dogs who love dog parks — whipworm eggs survive in soil for over five years
- Multi-pet households — higher environmental contamination
- Households with young children or immunocompromised people — the zoonotic risk warrants extra vigilance
Signs Your Pet Might Have Worms
Many worm infections show no visible signs at all — that's exactly why routine prevention matters. But here's what to watch for:
- Visible worms in stool or vomit — roundworms look like white spaghetti; tapeworm segments look like grains of rice near the tail
- Scooting — dragging the bottom along the ground (also linked to anal gland issues)
- Pot belly — especially in puppies and kittens
- Weight loss despite normal appetite
- Dull, rough coat
- Diarrhoea — particularly if bloody (hookworms) or mucoid (whipworms)
- Pale gums and lethargy — possible anaemia from hookworms
Can Worms Affect Humans?
Yes — and this is why pet worming isn't just about your pet.
Roundworms (Toxocara) are the biggest concern. Children playing in contaminated soil can accidentally ingest eggs. The larvae can migrate through organs (visceral larva migrans) or lodge in the eye (ocular larva migrans), potentially causing visual impairment. Australian studies have found Toxocara eggs in soil from Sydney parks and playgrounds (Palmer et al., Veterinary Parasitology).
Hookworms can penetrate human skin on contact with contaminated ground, causing intensely itchy "creeping eruption" tracks — more common in tropical Australia. Australian researchers first identified that dog hookworms can also cause eosinophilic enteritis in humans (Prociv & Croese, The Lancet, 1996).
Hydatid disease (Echinococcus granulosus) is the most serious. Humans who ingest eggs from dog faeces can develop slow-growing cysts in the liver or lungs that may require surgical removal. Around 20–40 cases are notified annually in Australia, mostly in rural areas.
Prevention is simple: worm your pets regularly, pick up faeces promptly, wash hands after gardening or handling pets, and cover children's sandpits.
What About Natural Dewormers?
You'll find plenty of alternative remedies promoted online — diatomaceous earth, pumpkin seeds, garlic, apple cider vinegar. Here's what the evidence says:
- Diatomaceous earth — works against insects with exoskeletons (like fleas), not soft-bodied intestinal worms. No peer-reviewed evidence of efficacy against helminths.
- Pumpkin seeds — contain cucurbitacin, which shows some laboratory activity against certain tapeworms, but no controlled veterinary studies support reliable use in pets.
- Garlic — while it has some antimicrobial properties in the test tube, garlic is toxic to dogs and cats. It causes oxidative damage to red blood cells (Heinz body anaemia). The ASPCA lists all Allium species as toxic to pets.
- Apple cider vinegar — no plausible mechanism of action against intestinal worms. Stomach acid neutralises it long before it reaches the intestines.
What We Notice at Petopia
Regular grooming and worming keep your best mates happy and healthy. Photo: Unsplash
Professional groomers handle your pet closely every few weeks — and sometimes we're the first to spot something. During a grooming session, we may notice:
- Tapeworm segments around the tail area during a sanitary trim
- Flea dirt in the coat — and where there are fleas, there's usually flea tapeworm risk
- Poor coat condition that might signal nutritional deficiency from chronic parasitism
- Skin irritation between the toes — potentially from hookworm larvae
- Gradual weight loss that you might miss seeing your pet every day
We're not vets and we don't diagnose — but we do keep an eye out, and we'll always let you know if we spot something worth a vet visit.
🐾 Petopia Grooming Tip: If your pet is on a topical product like Advocate, try to schedule grooming before application or at least 48 hours after. Bathing too soon can wash off the product and reduce its effectiveness. Oral products like NexGard Spectra and Simparica Trio aren't affected by bathing at all.
The Bottom Line
Worming your pet isn't complicated — but it does matter. A quarterly allwormer for adults, more frequent treatment for puppies and kittens, and year-round heartworm prevention covers most pets. Check with your vet about what's right for your pet's specific situation, especially if they hunt, roam, or live in a high-risk area.
A healthy pet starts from the inside out.
References
- Traub, R.J. et al. "Epidemiological and molecular evidence supports the zoonotic transmission of Ancylostoma caninum." Clinical Infectious Diseases.
- Palmer, C.S. et al. "Determination of the prevalence of Toxocara canis in Australian dogs." Veterinary Parasitology.
- Prociv, P. & Croese, J. (1996). "Human eosinophilic enteritis caused by dog hookworm Ancylostoma caninum." The Lancet, 347(9010), 1299–1302.
- Jenkins, D.J. et al. "Echinococcus granulosus in Australia." Advances in Parasitology.
- Kaplan, R.M. et al. (2023). "Emerging anthelmintic resistance in companion animal hookworms." International Journal for Parasitology: Drugs and Drug Resistance.
- Australian Veterinary Association (AVA). Parasite prevention guidelines.
- APVMA — Australian Pesticides and Veterinary Medicines Authority. Product registration data.
By Petopia Grooming, Eastgardens, Sydney
Questions about parasite prevention? Ask us at your next grooming appointment or visit petopiagrooming.com.au
