The biggest winter risks for cats aren’t snow and ice. They’re antifreeze, warm car engines, space heaters and the odd cold snap that catches an outdoor cat out. Most of them are easy to manage once you know where to look, and this guide covers each one, plus the signs that mean a trip to the vet.
Antifreeze: The One That Can’t Wait
If you only take one thing from this article, make it this. Traditional antifreeze contains ethylene glycol, which tastes sweet and is one of the most dangerous poisons a cat can come across. The Merck Veterinary Manual puts the minimum lethal dose for cats at about 1.4 mL of undiluted ethylene glycol per kilogram of body weight. For an average 10-pound cat, that works out to roughly a teaspoon. A cat walking through a puddle on the garage floor and then grooming its paws can swallow enough.
Timing is everything. Merck notes that the antidote treatment works in cats only if it’s started very early, ideally within about three hours of ingestion. The early signs (wobbling, looking “drunk”, vomiting) can fade after a few hours, so a cat can seem to recover while kidney damage is building. Don’t wait for symptoms. A suspected exposure is an emergency on its own.
What actually helps:
- Check under the car for green, pink or orange drips, especially after topping up coolant.
- Wipe up spills straight away and keep containers sealed and off the floor.
- Switch to propylene glycol antifreeze where you can. It’s much less toxic to pets, though not completely harmless.
- Remember the hidden sources. Some snow globes, toilet antifreeze in holiday cabins and windshield washer fluids also contain ethylene glycol.
Our room-by-room guide to household chemicals that are toxic to cats covers the garage in more detail.
Space Heaters, Fireplaces and Heating Pads
Cats will find the warmest spot in the house, and they don’t always judge distance well. The usual problems are singed whiskers and tail fur, burned paw pads on wood stoves, and heaters knocked over by a cat jumping past.
A few simple habits cover most of the risk:
- Use heaters with a tip-over shut-off and a cool-touch exterior, and keep them out of the cat’s jumping routes.
- Put a screen in front of open fireplaces and never leave a lit fire or candle in a room with an unsupervised cat.
- Be careful with human heating pads and electric blankets. They can get hotter than a cat can tolerate, and senior or arthritic cats may not move away quickly enough. If your cat loves warmth, a pet-specific heated bed with low, regulated output is the safer option. Our article on whether heated cat beds are safe and worth it goes through what to look for.
Carbon monoxide deserves a mention too. Furnaces, gas heaters and fireplaces run hard in winter, and pets are affected by carbon monoxide the same way people are. A working CO detector on each floor protects everyone in the house, cat included.
Why Banging on the Car Hood Is Worth the Embarrassment
A warm engine is a perfect winter hideout for an outdoor, stray or community cat. They crawl up into the engine bay or wheel well to sleep, and starting the car can seriously injure them.
Before you start a car that’s been parked outside, especially overnight, knock firmly on the hood, honk the horn or open the hood and take a look. It takes five seconds. This matters even if your own cat is indoors-only, because neighbourhood cats don’t know which car is yours.
Cold Weather and Cats Who Go Outside
Cats handle cold better than we do, but not as well as their fur suggests. A cat’s normal body temperature is around 100.5 to 102.5°F, and wet fur loses its insulating value fast. The AVMA’s cold weather guidance is simple: if it’s too cold for you, it’s probably too cold for your pet, and pets should be kept inside in freezing weather.
Some cats are at higher risk:
- Seniors and kittens, who regulate body temperature less well
- Cats with kidney disease, diabetes, hyperthyroidism or heart disease
- Thin or short-haired cats, and any cat with a wet coat
Hypothermia looks like shivering, then lethargy, slow movements, weakness and cold ears and paws. Frostbite usually hits ear tips, tail tips and paws. The skin may look pale or grey at first, then red and swollen as it warms. Don’t rub frostbitten areas or warm them with direct heat. Wrap the cat in a warm, dry towel and call your vet.
If your cat goes outside in winter, shorter trips in daylight help, along with a towel by the door for drying off. A warm, dry spot they can always get to matters too. For community cats you care for, our guide on how to build a DIY winter shelter for outdoor cats shows how to make one that actually holds heat.
De-Icing Salt and Winter Paws
Rock salt and many ice melts (sodium chloride, calcium chloride, magnesium chloride) can irritate paw pads and cause cracking. A cat that licks a lot off its feet can get an upset stomach, and larger amounts of salt can cause more serious problems.
- Wipe paws with a damp cloth when an outdoor cat comes in.
- Use a pet-safer ice melt on your own paths and steps. These products aren’t risk-free, but they’re generally less irritating.
- Store bags of ice melt sealed and out of reach. A torn bag in the garage is an invitation to investigate.
Indoor Winter Hazards You Might Not Think Of
When everyone’s inside more, the house gets busier and the risks shift a little:
- Open doors during deliveries and visitors. Darker evenings and a cold cat bolting outside is a bad combination. Our step-by-step guide on what to do if your cat gets out is worth reading before you need it.
- Clothes dryers. Cats sometimes climb into a warm dryer. Check before every load.
- Holiday decorations and plants arrive at the same time of year. We’ve covered those separately in holiday hazards for cats.
- Boredom. Less sunlight and fewer birds outside the window can mean a restless cat. A few ideas in winter cat enrichment go a long way.
When to See a Vet
Call your vet or an emergency clinic straight away if:
- You think your cat has licked or swallowed antifreeze, windshield washer fluid or snow globe liquid, even if they seem fine
- Your cat is shivering hard, very lethargic, weak or cold to the touch after being outside
- Ear tips, tail or paws look pale, grey, swollen or blistered
- You see burns, singed skin or a cat reluctant to put weight on a paw
- Your cat has been vomiting, wobbly or drooling after time in the garage or outdoors
For a suspected poisoning, the ASPCA Animal Poison Control Center (888-426-4435) and Pet Poison Helpline (855-764-7661) are staffed 24/7 (a consultation fee applies). They can advise while you’re on your way to the vet, not instead of going.
The Short Version
Seal and wipe up antifreeze, guard heaters and fires, knock on the car hood, bring cats in when it’s freezing, and wipe winter paws. That covers most of what goes wrong for cats between November and March.
What’s your cat’s favourite warm spot in winter, and is it one you approve of?