Australia’s frightening bugs are not all equally dangerous. A funnel-web spider is a genuine emergency, while a huntsman is mostly a large, fast-moving housemate. For pet owners, the main concerns are venomous bites and stings, paralysis ticks, disease-carrying mosquitoes, and invasive fire ants that may attack animals in groups.
Keep pets away from nests, woodpiles, long grass, rock piles and undisturbed garden debris. After walks or time outdoors, check dogs and cats carefully—especially around the ears, face, neck, between the toes and under collars. If your pet may have been bitten or stung and develops breathing trouble, weakness, vomiting, tremors, collapse or unusual drooling, contact a veterinarian immediately.
1. Sydney funnel-web spider
Atrax robustus is one of the best-known members of Australia’s eastern funnel-web group. Funnel-webs are usually around 1–5 cm in body length, but their heavy bodies, shiny dark colouring and prominent fangs make them especially alarming when discovered in garages, gardens or swimming pools.
Their venom can cause sweating, nausea, muscle twitching, breathing difficulty and loss of consciousness in people. A dog or cat that mouths one may drool, vomit, tremble, become weak or collapse. Treat a suspected bite as a veterinary emergency. Do not wait to identify the spider or try home remedies; take a photograph only if it can be done safely.
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2. Redback spider
Redbacks live across Australia and commonly build tangled webs around sheds, garden furniture, outdoor toilets, pot plants and other sheltered structures. The female is roughly the size of a large pea and usually has a conspicuous red stripe on her abdomen.
A redback bite can cause intense, persistent pain, sweating, headache, muscle weakness and spasms. Modern treatment means bites are generally not life-threatening to people, but a pet that has been bitten still needs prompt veterinary advice. Dogs and cats often investigate webs with their noses or paws, so keep them away from cluttered corners and shake out bedding stored outdoors.
3. Mouse spiders
Mouse spiders in the genus Missulena are stocky, short-legged spiders with bulbous heads. They grow to about 10–35 mm and are often mistaken for funnel-webs, especially when a large black individual emerges from soil or leaf litter.
Bites are uncommon, but some have caused serious symptoms resembling funnel-web envenomation. No human death has been recorded from a mouse-spider bite, yet that is not a reason to handle one—or allow a curious terrier or cat to play with it. Keep pets away from burrows and call a veterinarian if neurological or breathing symptoms follow a suspected bite.
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4. Australian tarantula, or barking spider
Australian tarantulas can have a body length of 2–11 cm and a leg span of up to 20 cm. Some can make a barking or whistling sound by rubbing parts of their body together. Their fangs may approach 1 cm, which explains why even a usually defensive spider deserves plenty of space.
They are not generally aggressive, but a provoked bite can be painful. Nausea and vomiting lasting six to eight hours have been reported in people. A pet may be injured if it corners one in a shed or under a log, so use a barrier to separate the animal rather than trying to catch the spider by hand.
5. Huntsman spider
Huntsman spiders are the classic Australian jump scare: they appear on walls, behind car sun visors and across dashboards, sometimes with a leg span of about 15 cm. Their size and speed are unsettling, but they are not considered dangerous to humans and generally try to escape instead of attack.
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They are also not Australian tarantulas; the two groups are unrelated. A huntsman may cause a pet to bark, panic or swat, but it is not usually a serious venom threat. Avoid spraying it with insecticide indoors. Move pets to another room and, if necessary, have the spider removed using a container and stiff card—or ask a local wildlife or pest professional for help.
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Ethmostigmus rubripes is Australia’s largest native centipede, reaching about 16 cm. It occurs across the country and hides under rocks, logs, bark and garden debris. Its modified first pair of legs, called forcipules, inject venom.
A bite can cause severe pain lasting several days. Australian centipede bites have not been recorded as fatal, but a dog or cat may suffer significant pain after nosing through leaf litter or disturbing a hiding place. Wear gloves when moving garden materials, keep pets away from piles of timber and contact your vet if swelling, pain or abnormal behaviour persists.
7. Bull ant or bulldog ant
Australia has around 90 bull-ant species in the genus Myrmecia. They range from about 8 mm to 40 mm and have unusually good vision. Some will track an intruder and chase it away from the nest.
A bull ant grips with its mandibles, curls its abdomen forward and stings—often more than once. Multiple stings can be particularly dangerous for a pet, and the venom may trigger a severe allergic reaction. Keep dogs on a lead around visible ant activity and do not let them dig at nests. Sudden facial swelling, hives, weakness, vomiting or breathing difficulty requires immediate veterinary care.
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The Australian paralysis tick, Ixodes holocyclus, is concentrated mainly in humid coastal areas of eastern Australia. It can infest wildlife, livestock, dogs, cats and people. Adult ticks are unpleasant enough to find; larvae may be only about 0.5 mm across and can be almost impossible to spot without a careful search.
Tick bites may cause allergic reactions and, rarely, paralysis; tick typhus is another possible complication. In pets, warning signs may include a changed bark or meow, gagging, coughing, vomiting, weakness in the back legs, wobbliness or difficulty breathing. Use a veterinary-approved tick preventive appropriate for the species and weight of your pet, and inspect the animal after outdoor trips. Never apply a dog tick product to a cat unless the label specifically says it is safe for cats.
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9. Australian scorpions
Australia has 29 described scorpion species in six genera. They are mostly nocturnal and live in places ranging from gardens and forests to deserts and tropical regions. Some grow to about 12 cm, and northern species tend to be larger and more venomous.
Scorpion stings usually cause local pain and inflammation lasting several hours, but the exact risk depends on the species and the victim. A cat batting at a scorpion or a dog investigating one with its mouth can receive a sting to the face or tongue. Shake out shoes, bedding and outdoor gear before use, and ask a veterinarian for advice after any suspected sting.
10. Cicada-killer wasp
Australian cicada-killer wasps in the genus Exeirus can reach about 4 cm and are sometimes incorrectly called “Australian hornets.” Australia has no native hornets; these large insects are wasps.
The female captures and paralyses a cicada, drags it underground and leaves it as food for her larva. Despite their size, cicada-killer wasps are not aggressive and are unlikely to sting unless extremely provoked. A dog that snaps at one may still receive a painful sting, so discourage chasing insects and leave active burrows alone.
11. Paper wasp
Paper wasps build open, papery nests beneath branches, verandas and house eaves. Native Polistes species occur throughout Australia, and the introduced Asian paper wasp has also been reported in several inner-city Sydney suburbs. They are usually tolerant when left alone, but nest disturbance can provoke defensive attacks.
One sting is painful; multiple stings can cause a more serious systemic reaction. Keep pets away from nests rather than knocking them down while animals are nearby. If a nest is close to a kennel, cat door or frequently used path, use a qualified pest professional and follow any instructions about keeping pets away during treatment.
12. Mosquitoes
More than 350 mosquito species occur in Australia. Only females bite, and most Australian mosquitoes do not carry disease, but infected mosquitoes can transmit illnesses including Ross River virus and Japanese encephalitis.
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Ross River virus can cause fever, rash and prolonged joint pain. Japanese encephalitis can cause serious neurological disease and can be fatal in a small proportion of symptomatic cases. Pets can also suffer from mosquito bites and, depending on species and location, mosquito-borne disease. Reduce exposure by removing standing water from pot saucers, buckets and children’s toys, keeping pets indoors during peak mosquito activity where practical, and discussing region-appropriate preventives with your veterinarian. Never use human insect repellent on an animal unless a vet has specifically approved it.
13. Red imported fire ant
The red imported fire ant, Solenopsis invicta, is not native to Australia. Established populations are contained in south-east Queensland, while isolated incursions elsewhere have been detected and treated. Biosecurity authorities also reported a Sydney interception in 2025.
These ants attack in groups and can sting repeatedly. Pets may step into a nest or lie on an infested patch, receiving many stings before they can escape. Signs can include intense distress, swelling, vomiting, weakness and breathing problems. Move the animal away from the ants without putting yourself at risk, contact a veterinarian urgently if symptoms are significant, and report suspected fire ants through the relevant state or territory biosecurity channel. Do not disturb or transport a suspected nest.
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Scary Australian bug myths that need retiring
White-tailed spiders do not have a proven flesh-eating bite
More than 100 investigated white-tailed spider bites found no cases of the necrotic ulcers popularly blamed on these spiders. Bites can still cause pain, redness, swelling or irritation, so a worsening wound should be assessed by a doctor or veterinarian—but “flesh-eating spider” is not a reliable diagnosis.
Huntsman spiders are not medically important monsters
Their size, speed and habit of appearing indoors make huntsmen memorable. They are nevertheless regarded as low risk to people and are usually more interested in escaping than attacking. The same common-sense approach applies around pets: prevent swatting, but do not panic or reach for a fogger.
Daddy-long-legs are not proven to be the world’s most venomous spiders
There is no good evidence that their venom is dangerously toxic to humans. Their small fangs also generally cannot pierce human skin effectively. They are not a reason to poison every web in a shed.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to do after a suspected bite or sting
- Move the pet away from the insect or spider. Avoid being bitten or stung yourself, and do not handle the animal responsible.
- Call your veterinarian or an emergency veterinary hospital. Describe the location, time, symptoms and any preventive medication the pet uses.
- Watch breathing and consciousness. Collapse, weakness, tremors, repeated vomiting, facial swelling, paralysis or breathing difficulty means urgent transport.
- Do not give human painkillers or antihistamines unless a veterinarian tells you to. Several common human medicines are toxic to pets, and the correct dose depends on the animal.
- Do not apply ice, alcohol, essential oils, insecticide or a tourniquet. These can worsen injury or delay proper treatment.
For people, a suspected funnel-web or other large black-spider bite is an emergency: call 000, keep the person still, and use a pressure-immobilisation bandage and splint. That technique is not a substitute for veterinary guidance in an animal and should not be used for ordinary spider bites or redback bites.
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FAQ
Which Australian bug is the biggest danger to dogs and cats?
There is no single answer for every region, but paralysis ticks, funnel-web spiders, bull ants and fire ants are among the most urgent concerns. Paralysis ticks are especially important because a bite may be difficult to see while envenomation can rarely cause paralysis.
How can I protect my pet from Australian paralysis ticks?
Use a veterinary-approved tick preventive suited to your pet’s species and weight, and check the animal after walks or garden time. Examine the ears, face, neck, toes, groin and under collars. If your pet develops weakness, gagging, vomiting, a changed voice or breathing trouble, seek emergency veterinary care.
Should I kill a huntsman spider if I find one in the house?
Usually not. Huntsman spiders are large and startling but are not considered dangerous to humans. Keep pets away, then relocate the spider with a container and card or ask a pest or wildlife professional for help. Avoid spraying insecticide around animals.
What should I do if my pet is bitten or stung?
Remove the pet from the area, prevent further exposure and call a veterinarian. Do not give human medication or apply household chemicals. Treat breathing difficulty, collapse, severe swelling, tremors, vomiting, weakness or suspected paralysis as an emergency.
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Australia’s most intimidating bugs are a mixed group: some are mostly harmless, some deliver painful venom, and paralysis ticks and fire ants can pose serious risks to pets. Prevention does the most work—use reliable tick control, inspect animals after outdoor activity, keep pets away from nests and clutter, and never assume a bite is harmless because the culprit is small.
Sources: Australian Museum funnel-web information, Australian Museum Australian paralysis tick guide, Healthdirect mosquito information and Australian Government fire-ant information.
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