The Canine Ledger

Winter Hazards: Antifreeze and Ice Melt

Antifreeze is an emergency even if your dog seems fine. Ice melt usually isn't. The signs, the timings, and what the poison experts advise.

Written by thecanineledger

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If you think your dog has drunk or licked antifreeze, go to a vet now, even if it seems fine. Take the container if you can. Don’t wait for signs, and don’t make your dog vomit unless a vet tells you to.

For ice melt, a lick or two of a paw usually isn’t serious. Contact your vet now if your dog has eaten more than a lick, is vomiting more than mildly, or has tremors, wobbliness or a seizure.

Our note: “Even if it seems fine” and “take the container” are our advice. The ice melt advice follows the ASPCA’s guidance for vets.

Antifreeze poisoning “is often fatal and primarily affects dogs and cats” (Merck Veterinary Manual, Ethylene Glycol Toxicosis in Animals, last updated September 2024). A dog can seem to recover about 12 hours later, while its kidneys are failing.

While both antifreeze and ice melt are winter chemicals, they’re very different risks. One is a race against time. The other usually causes nothing worse than a stomach upset. This page explains both.

1. Antifreeze: why it’s so dangerous

The poison. Most antifreeze contains ethylene glycol. Merck lists the reasons poisoning is common: “The widespread availability of antifreeze, its sweet taste, and small minimum lethal dose, along with improper storage, use, and disposal”.

It’s seasonal. In colder climates, “most cases occurring in the fall, winter, and early spring, when antifreeze is added to radiator fluid or when cooling systems are flushed.”

It isn’t only antifreeze. Merck names “some heat-exchange fluids used in solar collectors, ice-rink freezing equipment, and some brake and transmission fluids.”

Bittering helps, but not completely. Since 2012, US antifreeze makers “have added a bittering agent to their products to deter voluntary ingestion; however, the products still may be palatable to some animals.”

Our note: We haven’t checked whether antifreeze sold outside the US is bittered.

2. Antifreeze: the timeline

First hours. Merck’s owner guide says “Signs begin almost immediately and resemble alcohol (ethanol) poisoning.” Dogs vomit, drink and urinate a lot, and become dull and wobbly (Merck Veterinary Manual, pet owner version).

The false recovery. “Dogs may appear to briefly recover from these signs about 12 hours after ingestion.”

Kidney failure. “Severe kidney failure usually develops between 36 and 72 hours in dogs”. Signs then include lack of energy, loss of appetite, vomiting, mouth ulcers, and possibly seizures or coma.

Time is everything. The professional guide’s key point is that “Prognosis varies inversely with the amount of time that elapses between ingestion and initiation of treatment.” An antidote exists for dogs, but the owner guide says it “is only effective if given before kidney failure develops.” Once kidney failure is severe, “the outlook is poor.”

Why a vet, not home vomiting. Vets can empty the stomach within the first 1 to 2 hours, and then start treatment. A dog that’s already wobbly is at risk if made to vomit at home.

Our note: “A dog that’s already wobbly is at risk if made to vomit at home” is our reasoning, based on the signs Merck describes.

Prevention. Store antifreeze securely, clean up spills, and dispose of old fluid properly. The owner guide says “Antifreeze should be stored securely, and old antifreeze should be discarded.”

3. Ice melt: usually mild

What it’s made of. The ASPCA Animal Poison Control Center says ice melts “are commonly made of different kinds of salt”: sodium, potassium, calcium or magnesium chloride (ASPCA, Keeping Pets Safe during Winter: The Dangers of Ice Melts, 4 December 2018).

How dogs get it. Usually by licking their feet after a walk, or eating treated snow. Some “like the salty taste of ice melts and will eat it directly out of the packaging if given the chance.”

Most exposures are minor. The ASPCA’s guidance for vets says “a couple of licks of a paw or treated ground will not cause serious problems” (ASPCA Pro, Ice Melt Toxicity in Pets).

When it’s more serious. “The most common issue seen when a pet ingests ice melts is stomach upset or vomiting and diarrhea.” But eating a lot “can lead to an elevation in sodium level, causing tremors and seizures.” Calcium chloride can also cause mouth ulcers.

“Pet-friendly” isn’t harmless. The ASPCA says these products “typically contain urea or magnesium chloride”. They’re “typically safer ingredients”, but “may also cause stomach upset.”

4. Ice melt: protecting paws

The ASPCA advises:

  • Don’t let your dog eat salt or treated snow, “especially the slushy snow”.
  • Wipe your dog’s paws with a damp cloth as soon as you’re home.
  • If your dog’s pads become irritated, cracked or bleeding, consider paw wax or boots.
  • Keep ice melt packaging out of reach.

If you’re choosing a product and your dog licks its feet or outdoor puddles, the ASPCA’s vet guidance suggests products that list urea as the main ingredient, “since it is the least irritating to the stomach of all the potential ingredients.”

→ Animal Poison Helplines by Country: Numbers, Fees, and What Works From Where · → My Dog Ate Something: Why You Shouldn’t Make Them Vomit Without a Vet · → Emergency Signs in Dogs: When to Go Now, Not Tomorrow

5. What we could not verify

Commonly saidWhat we found
“If my dog seems fine after antifreeze, it’s fine”No. Dogs can seem to recover at about 12 hours, before kidney failure at 36 to 72 hours.
“Antifreeze tastes bitter now, so dogs won’t drink it”Not reliably. US makers add a bittering agent, but some animals may still drink it.
“Ice melt is toxic to dogs”Usually only mildly. A couple of licks won’t cause serious problems; large amounts can.
“Pet-friendly ice melt is completely safe”No. It’s safer, but can still upset the stomach.
“Road salt burns paws”It can irritate them. The ASPCA describes irritated, cracked or bleeding pads. We found no study of how often.
“Antifreeze is only a problem in winter”Mostly autumn to spring, in cold climates. Other fluids contain it too.

Sources

Always confirm with your vet before acting on anything on this page.