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Is Antifreeze (Ethylene Glycol) Toxic to Dogs?
Antifreeze is one of the most dangerous toxins your dog can encounter. Ethylene glycol has a sweet taste that attracts animals, and even tiny amounts cause irreversible kidney failure. As little as 1–2 tablespoons can be fatal for a medium-sized dog. Immediate treatment within the first few hours is critical — delay dramatically reduces survival chances. If you suspect your dogs has ingested antifreeze (ethylene glycol), contact your veterinarian or nearest emergency vet clinic immediately.
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).
Ethylene glycol itself causes intoxication (similar to alcohol). However, the liver metabolizes it into glycolic acid, which causes severe metabolic acidosis, and then into oxalic acid, which binds with calcium to form calcium oxalate crystals that destroy the kidneys. The lethal dose is extremely small: 4.4 mL per pound of body weight (1.5 mL/kg). The sweet taste makes it attractive to pets. Propylene glycol antifreeze is a safer alternative but still not recommended.
How Much Is Dangerous?
The risk depends on your dogs's weight and the amount ingested.
| Pet Weight | Dangerous Amount | Expected Severity |
|---|---|---|
| Small dog (under 10 lbs / 4.5 kg) | Less than 1 tablespoon (5–10 mL) | Potentially Fatal |
| Medium dog (25–50 lbs / 11–23 kg) | 1–2 tablespoons (15–30 mL) | Potentially Fatal |
| Large dog (50–90 lbs / 23–41 kg) | 2–4 tablespoons (30–60 mL) | Potentially Fatal |
| Any size dog | Treatment must begin within 3–6 hours for best outcome | Potentially Fatal |
Symptoms to Watch For
Symptoms of antifreeze (ethylene glycol) poisoning in dogss typically progress through these stages:
Stage 1: Intoxication
30 min – 12 hours- Appears 'drunk' — stumbling, swaying
- Excessive thirst and urination
- Vomiting
- Seizures possible
Stage 2: Cardiopulmonary
12–24 hours- Rapid breathing
- Elevated heart rate
- Lethargy
- Dehydration
- Metabolic acidosis
Stage 3: Kidney Failure
24–72 hours- Oliguria (little/no urine)
- 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 dogs lives or dies.
Get the First Aid Guide — Protect Your Dogs →Be Ready If This Happens to Your Dogs
You just read what antifreeze (ethylene glycol) does to dogss. 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 dog to a veterinary emergency clinic IMMEDIATELY — every minute counts.
- 2 Do NOT wait for symptoms — by the time symptoms appear, kidney damage may already be starting.
- 3 Call the clinic en route so they can prepare the antidote (fomepizole).
- 4 If you find antifreeze on your dog's paws or fur, wash it off immediately to prevent further licking.
- 5 Bring the antifreeze container so the vet can confirm the active ingredient.
- 6 Check your garage and driveway for spills — even licking a small puddle can be fatal.
Treatment and Recovery
The antidote is fomepizole (4-methylpyrazole), which blocks the enzyme that converts ethylene glycol into its toxic metabolites. It must be administered within 3–6 hours for maximum effectiveness. If fomepizole is unavailable, ethanol IV can be used as an alternative. Aggressive IV fluids support kidney function. Blood tests monitor ethylene glycol levels, kidney values (BUN, creatinine), and blood pH. If kidney failure has already developed, dialysis may be required. Without treatment, death occurs within 24–72 hours. With early fomepizole treatment, survival rates exceed 90%.
Estimated Cost
$500 – $8,000
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Having basic first aid supplies and an emergency reference on hand is something most veterinary professionals recommend.
Frequently Asked Questions
How fast does antifreeze kill a dog?
Without treatment, ethylene glycol poisoning causes death within 24–72 hours from irreversible kidney failure. The critical window for treatment is the first 3–6 hours. After 12 hours, the prognosis drops significantly because toxic metabolites have already formed and begun destroying the kidneys.
Is there a safe antifreeze?
Propylene glycol antifreeze (sold as 'pet-safe' or 'RV antifreeze') is significantly less toxic than ethylene glycol. However, it can still cause problems in large amounts. The safest approach is to use propylene glycol products and keep ALL antifreeze stored securely and clean up spills immediately.
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Sources & Citations
- 📎 ASPCA Animal Poison Control Center (APCC)
- 📎 WSU Veterinary Toxicology Helpline
- 📎 AVMA — Poisoning & Toxins
- 📎 Pet Poison Helpline
Toxicity data is based on published veterinary toxicology references. In an emergency, contact your veterinarian or nearest emergency vet clinic immediately.
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 2026-04-09.
