TL;DR: Antifreeze ingestion is a life-threatening medical emergency for dogs that leads to rapid, fatal kidney failure without immediate veterinary intervention. Even a small amount is toxic, so you must seek professional help immediately, even if your dog is not yet showing symptoms.
What is antifreeze poisoning and why is it dangerous for my dog?
Antifreeze typically contains ethylene glycol, a chemical that is extremely toxic to dogs even in minute quantities. Because it has a sweet taste, dogs are often tempted to lick spills. Once ingested, the substance is rapidly absorbed by the body and processed by the liver into toxic metabolites that cause sudden, severe kidney failure.
Is antifreeze ingestion a medical emergency for my dog?
- Yes, this is a critical, high-level medical emergency with no safe amount of ingestion.
- Even a few licks from a garage floor can be fatal to a dog.
- Immediate veterinary intervention is the only way to prevent permanent organ damage or death.
- You must seek help even if your dog appears fine, as internal damage begins long before outward symptoms show.
Why should I take a photo of the antifreeze product label for the veterinarian?
- If it is safe to do so, quickly snap a photo of the antifreeze container or the spill.
- Different brands use different chemical bases, such as ethylene glycol or the slightly less toxic propylene glycol.
- Showing your veterinarian the exact brand and ingredient list helps them determine the specific toxicity level.
- This information allows the medical team to choose the most effective treatment protocol for your dog immediately.
Clinical Context (Merck Veterinary Manual)
Following ethylene glycol (EG) ingestion in dogs, rapid intervention is crucial. Diagnostic indicators within 3 hours include normochloremic metabolic acidosis with an increased anion gap, minimally concentrated or isosthenuric urine with an acidic pH, and marked serum hyperosmolality with an increased osmolal gap (potentially as high as 100 mOsm/kg above normal). Monohydrate calcium oxalate crystals may be observed in urine as early as 6 hours post-ingestion. Prompt treatment is essential, focusing on preventing EG metabolism using 4-methylpyrazole (4-MP, fomepizole), the treatment of choice for dogs, at an initial IV dose of 20 mg/kg, followed by 15 mg/kg IV at 12 and 24 hours, and 5 mg/kg IV at 36 hours. If 4-MP is unavailable, ethanol can be considered. Fluid therapy should be initiated to correct dehydration and promote EG excretion. Activated charcoal is unlikely to be effective.
Chapter: Toxicology, Nephrology
Source: The Merck Veterinary Manual, 11th Edition (Page 3048)