Is Antifreeze (Ethylene Glycol) Toxic to Cats?
Antifreeze is as lethal to cats as it is to dogs — even a few laps of spilled antifreeze can cause fatal kidney failure. Cats are attracted to the sweet taste. The lethal dose for cats is even smaller than for dogs. Immediate treatment within 3–6 hours is critical for survival. If you suspect your cats has ingested antifreeze (ethylene glycol), contact your veterinarian or nearest emergency vet clinic immediately.
✓ You're doing the right thing by checking — Antifreeze (Ethylene Glycol) is toxic to cats, and acting quickly can make a real difference. You did the right thing by looking this up.
If Your Pet May Have Ingested Something Toxic
Contact your veterinarian or nearest emergency vet clinic immediately. Do not wait for symptoms to appear — early intervention significantly improves outcomes.
| Toxic? | Severity | Time to Onset | Commonness | Urgency |
|---|---|---|---|---|
| Yes | Potentially Fatal | 30 minutes – 12 hours | Moderate (seasonal) | Immediate |
The Toxic Principle
The dangerous compound in Antifreeze (Ethylene Glycol) is Ethylene glycol (metabolized to glycolic acid and oxalic acid).
Identical mechanism to dogs: ethylene glycol is metabolized into glycolic acid (causing metabolic acidosis) and oxalic acid (which forms calcium oxalate crystals that destroy kidney tubules). The lethal dose for cats is approximately 0.6 mL per pound (1.3 mL/kg) — even less than for dogs. A few laps of spilled antifreeze from a garage floor can be fatal.
How Much Is Dangerous?
The risk depends on your cats's weight and the amount ingested.
| Pet Weight | Dangerous Amount | Expected Severity |
|---|---|---|
| Small cat (5–8 lbs / 2–4 kg) | Less than 1 teaspoon (3–5 mL) | Potentially Fatal |
| Medium cat (8–12 lbs / 4–5.5 kg) | 1 teaspoon to 1 tablespoon | Potentially Fatal |
| Large cat (12–18 lbs / 5.5–8 kg) | 1–2 tablespoons | Potentially Fatal |
| Any cat | Treatment must begin within 3–6 hours for best outcome | Potentially Fatal |
Symptoms to Watch For
Symptoms of antifreeze (ethylene glycol) poisoning in catss typically progress through these stages:
Stage 1: Intoxication
30 min – 12 hours- Appears 'drunk'
- Vomiting
- Excessive thirst
- Polyuria (increased urination)
Stage 2: Cardiopulmonary
12–24 hours- Rapid breathing
- Elevated heart rate
- Lethargy
- Dehydration
Stage 3: Kidney Failure
24–72 hours- No urine production
- Seizures
- Coma
- Death
- Irreversible kidney damage
You just learned the symptoms. Now be ready for them.
The #1 regret pet owners have after an emergency? "I wish I'd been prepared."
You care enough to research this — that puts you ahead of most pet owners. But research without preparation is just worry. This guide covers exactly what to do in the first 15 minutes after poisoning — the window that determines whether your cats lives or dies.
Get the First Aid Guide — Protect Your Cats →
Be Ready If This Happens to Your Cats
You just read what antifreeze (ethylene glycol) does to catss. The symptoms. The suffering. The $500–$8,000 vet bill. The question is: are you prepared if it happens again?
Get the Emergency Kit — Be Ready →What to Do Right Now
- 1 Get your cat to a veterinary emergency clinic IMMEDIATELY.
- 2 Do NOT wait for symptoms — by then kidney damage may be irreversible.
- 3 Call ahead so the clinic can prepare the antidote (fomepizole).
- 4 Wash any antifreeze off your cat's paws or fur.
- 5 Bring the antifreeze container.
- 6 Clean up ALL antifreeze spills immediately and store containers securely.
Treatment and Recovery
Identical to dog treatment: fomepizole (antidote that blocks metabolism of ethylene glycol), aggressive IV fluids, blood monitoring for ethylene glycol levels and kidney function. With fomepizole treatment within 3–6 hours, survival rates are high. After 12 hours, prognosis drops sharply. Cats that survive may have permanent kidney damage requiring long-term management.
Estimated Cost
$500 – $8,000
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Why Antifreeze (Ethylene Glycol) Is Dangerous for Cats
Cats are especially vulnerable to antifreeze (ethylene glycol) because they have a significantly smaller body mass and a liver that metabolizes certain compounds differently than humans or dogs. The toxic principle — Ethylene glycol (metabolized to glycolic acid and oxalic acid) — can overwhelm a cat's detoxification pathways rapidly, making even small ingestions a medical emergency. Symptoms typically begin within 30 minutes – 12 hours of ingestion.
Identical mechanism to dogs: ethylene glycol is metabolized into glycolic acid (causing metabolic acidosis) and oxalic acid (which forms calcium oxalate crystals that destroy kidney tubules). The lethal dose for cats is approximately 0.6 mL per pound (1.3 mL/kg) — even less than for dogs. A few laps of spilled antifreeze from a garage floor can be fatal.
Other Substances to Watch For
If your cats got into antifreeze (ethylene glycol), be aware of these related hazards that often appear in the same contexts:
Expected Veterinary Costs
Based on typical emergency treatment for antifreeze (ethylene glycol) toxicity in cats, including:
- •Emergency exam and stabilization
- •Induction of vomiting and activated charcoal
- •IV fluid therapy and monitoring
- •Possible overnight hospitalization
Actual costs vary by location, clinic, and severity of the case. Emergency clinics typically charge more than daytime veterinary offices.
Frequently Asked Questions
How much antifreeze will kill a cat?
Very little. The lethal dose for cats is approximately 0.6 mL per pound. For a 10 lb cat, that's roughly 1 teaspoon. A few laps from a puddle can be fatal. Any suspected exposure requires immediate veterinary care.
How can I keep my cat safe from antifreeze?
Store antifreeze in sealed containers in locked cabinets. Clean up spills immediately. Consider switching to propylene glycol antifreeze (less toxic). Keep cats indoors or supervise outdoor access near garages and driveways.
People Also Ask
One more thing to check
Many cats owners who worry about antifreeze (ethylene glycol) also need to know about Is Antifreeze Toxic to Dogs?. If your cats had access to antifreeze (ethylene glycol), they may have been exposed to other hazards too.
Related Dangers
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Sources & Citations
Toxicity data is based on published veterinary toxicology references. In an emergency, contact your veterinarian or nearest emergency vet clinic immediately.
📚 Sources & Methodology
Toxicity data compiled from the following veterinary toxicology databases:
- • ASPCA Animal Poison Control Center — case data and species-specific toxicity ratings
- • Pet Poison Helpline — dosage threshold data and symptom timelines
- • Merck Veterinary Manual — clinical treatment protocols
Weight-based severity thresholds are calculated using established veterinary toxicology formulas. All "toxic" and "non-toxic" classifications are based on peer-reviewed veterinary literature. Last reviewed: May 2026.
Medical Disclaimer: The information on this page is for educational purposes only and is not a substitute for professional veterinary advice. If you suspect your pet has been poisoned, contact your veterinarian or nearest emergency vet clinic immediately. This page was last reviewed on 2026-06-12.
Sable T. Thornwood
Pet Toxicity Researcher
Sable T. Thornwood has spent over a decade researching pet toxicity and companion animal safety, with a focus on common household substances, plants, and foods. Her research draws on veterinary toxicology databases, ASPCA case records, and peer-reviewed clinical literature to help pet owners make informed, timely decisions during potential poisoning events.
About Sable & PetToxCheck