Autumn Hazards for Cats: Antifreeze, Mushrooms, Rodent Bait and More

By Tailwisp Editorial TeamUpdated October 20, 20264 min read

As the weather cools, cats may spend more time indoors, but autumn has its own hazards. Garages fill with antifreeze, gardens with mushrooms and rodent bait, and Halloween brings candy and costumes. A little vigilance in the fall can prevent a tragedy.

Antifreeze

Antifreeze and some coolants contain ethylene glycol, which tastes sweet to cats. Even a teaspoon can be fatal. Signs, which can appear within an hour, include drunken behavior, vomiting, thirst and lethargy, followed by kidney failure within a day or two. There is a narrow window for treatment, so go to a vet at once.

• Store antifreeze in sealed containers on high shelves.
• Clean spills immediately, and wash the area.
• Consider products made with propylene glycol, which is less toxic, though still not harmless.
• Check cars for leaks.
• Do not let your cat roam in garages or driveways.

See cat poisoning: what to do and chronic kidney disease in cats.

Rodent bait

As temperatures fall, mice move indoors, and people put out poison. Rodenticides can poison cats directly, or secondarily when the cat eats a poisoned rodent. Some cause bleeding, while others cause brain swelling or kidney failure. Use snap traps in covered stations, or call a professional, and never place bait where pets can reach. If you suspect exposure, call your vet immediately and bring the package.

Mushrooms and fungi

Wet autumn weather brings mushrooms, and some species are extremely toxic. Cats are less likely to eat mushrooms than dogs, but exposure happens. Check the yard, and remove mushrooms with gloves. If your cat eats one, try to take a sample or photo, and call a vet. See can cats eat mushrooms.

Plants, bulbs and leaves

Autumn crocus, chrysanthemums and some bulbs are toxic. Lilies are deadly. See lilies and cats: why they are deadly and toxic houseplants for cats. Piles of damp leaves can hide mold, insects and wildlife. Compost piles with rotting food can contain mold toxins. Keep cats away.

Fallen fruit and nuts

Rotting fruit may ferment and contain alcohol, and some seeds, such as apple seeds and stone fruit pits, contain cyanide compounds. Walnuts and other nuts can develop mold. See is alcohol dangerous for cats and can cats eat nuts.

Halloween

• Candy. Chocolate is toxic, and sugar-free candy may contain xylitol. See is chocolate toxic to cats and is xylitol toxic to cats. Wrappers can cause blockages.
• Decorations. Candles, cords, glow sticks and fake spider webs can harm cats.
• Costumes. Many cats dislike them. Only use if the cat is comfortable, and supervise.
• Door traffic. Trick-or-treaters can frighten cats or let them escape, so keep cats in a quiet room.
• Black cats. Keep indoors around Halloween as a precaution. See black cats.

See holiday hazards for cats.

Hunting season and wildlife

In some areas, hunting seasons start in fall. Keep cats indoors, or use bright collars. Wildlife also moves, so predators may be more active at dusk.

Cold nights and shelter

As temperatures drop, outdoor cats seek warmth in engine bays. Bang on the hood before starting the car. See winter safety for cats.

Parasites

Fleas and ticks remain active in fall. Keep prevention up to date. See fleas on cats and ticks on cats.

Heating and chimneys

Have heaters checked, and use guards on fires. Keep cats away from space heaters and candles.

Emergencies

Keep the number for your vet and a poison hotline handy. Do not induce vomiting unless told to. See cat emergency warning signs and cat first aid kit.

Preparing the home for fall

Walk through the garage, shed and basement, and put away antifreeze, rodent bait, paint and fertilizer. Check for mouse holes, and seal them. Rake leaves away from play areas, and remove mushrooms. Update vaccines and parasite prevention. Review your cat's microchip details, and keep emergency numbers visible. Small habits now prevent emergencies later.

Cats and seasonal behavior

Shorter days and cooler weather can change cat behavior. Some cats become more active indoors, while others sleep more. Outdoor cats may roam further for food, or seek shelter in garages and sheds. Keep meals and play on a steady schedule, and offer warm beds. Watch for weight gain as activity falls, and see a vet if your cat seems stiff, since cold can aggravate arthritis.

When to see a vet

If you suspect poisoning, go at once. Use the US vet directory to find a clinic.