If you top up the coolant in your car this winter, or notice a small puddle under the bonnet on a frosty morning, there is a hidden danger sitting in your driveway that far too many Aussie owners overlook. Antifreeze and engine coolant taste sweet, and that sweetness is exactly what makes them so deadly to curious dogs and cats. A puddle no bigger than a coffee splash can be enough to cause fatal kidney failure.
With more of us running heaters, topping up radiators and doing garage jobs through the colder months, winter is when these products get spilled and left about. Here is what every dog and cat owner in Australia needs to know to keep their pet safe.
Why winter raises the risk
Most traditional antifreeze and engine coolant contains ethylene glycol, a chemical that is highly toxic to pets. Through the cooler months, more of it ends up within a pet’s reach: leaking radiators drip onto the driveway, containers get left open during weekend car maintenance, and reservoirs are topped up in the garage where pets wander. Because ethylene glycol has a sweet flavour, animals will happily lap it up rather than avoid it.
Cats are at particular risk. They do not even need to drink from a puddle – walking through a spill and later grooming the coolant off their paws and fur can be enough to poison them.
How little it takes
This is not a case where a large gulp is needed to cause harm. Veterinary sources indicate that only a few teaspoons can be fatal to a dog, and cats can be poisoned by an even smaller amount. Once swallowed, ethylene glycol is broken down in the body into compounds that form crystals in the kidneys, and pets that reach full kidney failure have a very poor outlook. That is why acting quickly matters so much.
Where pets come across it
Antifreeze and ethylene glycol turn up in more places than most owners realise. Common sources around Australian homes include:
- Leaks and drips under cars, radiators and coolant reservoirs
- Open or spilled containers left out during car servicing
- Puddles on driveways, in garages and on garage floors
- Some snow globes, portable basketball hoop bases and certain paints or inks
The same ‘sweet but deadly’ rule applies to other winter garden and garage hazards. If you have not already, it is worth reading up on rat bait poisoning and, for cat owners, why lilies can cause kidney failure.
Warning signs to watch for
Antifreeze poisoning often unfolds in stages, and the middle stage is dangerously deceptive because your pet can seem to improve before becoming critically ill. Signs may appear within 30 minutes to a few hours of exposure and can include:
- Wobbliness or a ‘drunk’, staggering walk
- Vomiting and drooling
- Drinking and urinating much more than usual
- Rapid breathing and a racing heart
- Weakness, tremors, seizures or collapse
A day or two later, as the kidneys shut down, a pet may go quiet, stop producing much urine and deteriorate quickly. If you notice any of these signs – or you suspect your pet had access to coolant – do not wait to see how it goes.
What to do right now
Antifreeze poisoning is a genuine emergency and treatment is far more likely to work when it starts early, before kidney damage sets in. If you think your dog or cat has been exposed:
- Call your vet or the nearest emergency animal hospital immediately
- Phone the Animal Poisons Helpline on 1300 869 738 – a free service that can advise whether your pet needs urgent assessment
- Take any packaging or a note of the product with you if you can
- Do not try to treat your pet at home or wait for symptoms to worsen
Vets have an antidote that blocks the body from converting ethylene glycol into its most harmful form, but it works best when given as soon as possible after ingestion. Every hour counts. This article is general information only – always consult a licensed veterinarian for diagnosis or treatment specific to your pet.
How to protect your pet
A few simple habits go a long way this winter:
- Fix radiator and coolant leaks promptly, and clean up any spills straight away
- Store antifreeze and coolant in sealed containers, well out of reach
- Keep pets out of the garage and off the driveway while you work on the car
- Consider switching to a pet-safer coolant based on propylene glycol, which carries a much lower risk if accidentally ingested
- Dispose of old coolant responsibly rather than tipping it down a drain or driveway
Frequently asked questions
How much antifreeze is dangerous to a dog or cat? Very little. Veterinary sources suggest only a few teaspoons can be fatal to a dog, and cats can be poisoned by an even smaller amount – sometimes just from licking it off their paws. Treat any suspected exposure as an emergency.
How quickly do symptoms appear? Early signs such as wobbliness, vomiting and increased thirst can show within 30 minutes to a few hours. A pet may then appear to recover before kidney failure develops a day or two later, which is why prompt veterinary care is so important.
Is there a pet-safe antifreeze? Coolants based on propylene glycol are considered much less toxic than traditional ethylene glycol products, though no product is completely risk-free. Cleaning up spills and keeping pets away from coolant is still essential.
What number do I call in Australia? The Animal Poisons Helpline on 1300 869 738 is a free service for Australian pet owners, alongside your regular or emergency vet.
Key takeaways
- Antifreeze and coolant taste sweet but are highly toxic – a few teaspoons can be fatal
- Winter car maintenance means more spills within reach of pets, and cats can be poisoned just by grooming it off their fur
- Early signs include a staggering walk, vomiting and increased thirst, often followed by a deceptive ‘recovery’
- Treat any suspected exposure as an emergency – call your vet or the Animal Poisons Helpline on 1300 869 738 without delay
- Fix leaks, clean spills, store coolant securely and consider a propylene glycol alternative
