
13/03/2025
🕷 The redback spider (Latrodectus hasselti), also known as the Australian black widow, is a highly venomous spider species native to Australia. Due to its wide distribution, the redback spider is arguably the most clinically significant spider in Australia. Adult females are the most commonly seen, and can be identified by their smooth black body and wide red stripe on the abdomen. Males are less boldly coloured, often light brown, and smaller in size (3-4 mm) and are of less clinical importance due to their much smaller fang size. These adaptable arachnids are particularly common in human-inhabited areas, but prefer dry, dark areas where they will not be disturbed. This means they are often found lurking in garden sheds and garages.
Dogs are curious animals and may accidentally come into contact with redback spiders, which can lead to a bite. The venom contains α-latrotoxin which affects the nervous system and muscles. Many bites may be ‘dry-bites’ where no venom is injected, however a bite where venom is injected can be life-threatening for a small animal. Early signs in small animals include vomiting, diarrhoea, pain, and restlessness. Progressive signs may include increasingly severe pain (which typically spreads away from the bite site), muscular cramping, agitation, an increased heart rate and increased blood pressure. Cats are particularly sensitive to the venom and can then go on to develop paralysis, inability to breath, cardiac failure and death.
To avoid spider bites in pets (many of these measures are also good for preventing snake bites);
✅ Keep outdoor spaces tidy to reduce spider-friendly hiding spots.
✅ Clean outdoor furniture and building eaves/verandas regularly to remove webs and spider sacs.
✅ Pack away children’s toys that are not used regularly.
✅ Remove items stored in yards that are not needed (e.g., tyres, old wood piles).
✅ Clean up leaves and sticks and remove them from pet accessible areas.
✅ Regularly check your pet’s bedding, toys, and outdoor areas for spiders.
Whilst ensuring the wellbeing of your poisoned pet is paramount, veterinary care for poisoning can often be costly. Pet insurance provides peace of mind and protection in these events. The Animal Poisons Helpline is proudly sponsored by Bow Wow Meow Pet Insurance, who are currently offering two months of their Nose-to-Tail Cover for free in the first year of coverage for Helpline followers. Visit https://quote.bowwowinsurance.com.au/?promo=AP368 for more information.
The Animal Poisons Helpline provides free advice to pet owners in Australia and can be reached on ☎️ 1300 869 738 (AU), 0800 869 738 (NZ), 3106 4216 (SG), (917) 722-5958 (US) or +1917 722-5958 (CAN). If you are a member of a veterinary team you can also join the Animal Poisons Centre For Vets Facebook group which is regularly updated with toxicology tidbits and poisoning trends.