My dog only licked a stain under the car: should I worry?

Yes, it should be handled as a potential emergency. Ethylene glycol is toxic in small amounts and the animal does not need to drink much to risk kidney damage, especially a cat. Do not wait for symptoms to appear: call the clinic or a poison line right away, say you suspect antifreeze, note the time and estimated amount, and get moving. The antidote is only effective in the first hours, so speed matters more than anything else.

The animal seemed drunk but is fine now: is the danger over?

No, and this is exactly the deception of ethylene glycol. The early phase with a wobbly gait can ease off and give the impression of recovery, but in the meantime the toxic metabolites are setting up the kidney damage, which shows up severely one to three days later. The apparent improvement is not a cure and is in fact the moment when the antidote risks becoming useless. An immediate clinical assessment is still needed.

Should I make my dog or cat vomit before going to the clinic?

Not on your own. In some cases inducing vomiting can be dangerous, for instance if the animal is confused or poorly responsive, with a risk of aspiration, and in any case it does not remove the glycol already absorbed. The decision on how and whether to empty the stomach belongs to whoever is weighing species, elapsed time and level of consciousness. Call, describe the situation and follow the instructions: the most useful thing you can do is arrive quickly.

How long do I have for the antidote?

The window is only a few hours, because the antidote works by blocking the conversion of glycol into its toxic metabolites: once that conversion has happened, the drug can no longer prevent the kidney damage. There is no single limit that fits every case, but the principle is that the sooner you arrive, the better. That is why antifreeze poisoning is treated as a race against the clock, acting on the suspicion of ingestion rather than waiting for symptoms.

Are there antifreeze products that are less dangerous to animals?

Some products use propylene glycol instead of ethylene glycol and it is considered less toxic, though not entirely harmless. Choosing them lowers the risk, but it does not remove the need to store, use and clean up these fluids with the greatest care. Even the safest product should be kept closed and away from animals, and every spill should be removed at once. Prevention remains the main line of defence.

Emergencies and first aid11 min readUpdated on August 20, 2026

Antifreeze poisoning in dogs and cats: why it is a race against the clock

Antifreeze tastes sweet and attracts dogs and cats, the toxic dose is tiny and the antidote only works in the first hours: why it is a call-immediately emergency.

Audience: Pet owners
Species: Dog, Cat
Scope: Valid everywhere, European Union, Italy

Radiator antifreeze and some screen wash fluids contain ethylene glycol, a substance that combines three dangerous traits: it has a sweet taste that tempts dogs and cats to lap it up, it is toxic in very small amounts, especially in cats, and it leaves a window of only a few hours in which the antidote can still save the kidney. The trap with this poison is that the early picture looks mild and then seems to improve, giving the illusion that the danger has passed, while behind the scenes the kidney damage is quietly being set in motion. Waiting for severe symptoms to appear almost always means arriving too late, when the antidote no longer helps and only dialysis remains. That is why antifreeze poisoning is one of the emergencies where an immediate phone call, even with an animal that looks perfectly normal, makes the difference between recovery and irreversible kidney failure.

Why antifreeze is a different kind of poison

Most household toxins offer the owner at least one advantage: an unpleasant taste that discourages eating, a wide safety margin, or immediate symptoms that prompt a rush to the clinic. Ethylene glycol offers none of these. It is sweet, so it is lapped up willingly and even in quantity. It is potent, so very little is needed. And early on it produces subtle signs, so it does not frighten anyone. That combination makes it one of the most insidious poisons in veterinary practice.

Sweet taste: dogs and cats drink it readily from a puddle under the car, an open container or a radiator leak, without needing to be coaxed.
Tiny toxic dose: in cats a few millilitres, even just the fluid licked off the paws after walking through a spill, can be enough; in dogs the amount is larger but still small compared with the volume of a container.
Organ damage, not just malaise: the problem is not the glycol itself but the products the liver turns it into, which crystallise in the kidney and destroy it.
Narrow antidote window: the antidote blocks that very conversion, so it works only if given before it happens, meaning within the first hours.

Where it is found and when the risk rises

Ethylene glycol is not only in radiator antifreeze. It turns up in several everyday products, often stored in garages, cellars and car ports, exactly the places an animal can reach during the cold seasons when these fluids are used most.

Common sources and risky situations
Source	Where it happens	Why it is dangerous
Radiator coolant	Leaks under the car, coolant changes, an open container	The classic source, sweet and highly concentrated
Screen wash and de-icer	Garage, boot, storage cupboard	Some formulations contain ethylene glycol
Brake fluid and some defrosters	Home workshops, low shelves	Containers often without a child-proof cap
Snow globes and some ornamental liquids	Home, window sills, low tables	The fluid inside can contain ethylene glycol
Coloured puddles on driveways and car parks	Yards, garages, roads in winter	The animal drinks off the ground unnoticed

The riskiest time is the cold season, when radiators are topped up and de-icers are in use, but coolant leaks can happen all year round. A sweet, sticky stain under a car, often green, blue, pink or orange, should always be treated as dangerous until proven otherwise.

The three clinical phases, and why phase two deceives

Ethylene glycol poisoning does not follow a straight line: it moves through phases, and the second one is what leads owners astray. Knowing this progression is what lets you understand why waiting is not an option.

The three phases and their telltale signs
Phase	When it appears	What you see
Phase 1, neurological	About 30 minutes to 12 hours after ingestion	The animal looks drunk: it staggers, is disoriented, drinks and urinates a lot, may vomit, tremble and in severe cases seizure
Phase 2, apparent recovery	About 12-24 hours after ingestion	The neurological signs ease and the animal seems better, while kidney damage is already starting
Phase 3, kidney failure	About 24-72 hours after ingestion	The kidney shuts down: vomiting, deep lethargy, ammonia-like breath, little or no urine, often an irreversible picture

The practical lesson is stark: symptoms are a poor clock. By the time phase three signs appear it is almost always too late for the antidote. The only sensible approach is to act on the suspicion of ingestion, not on the wait for symptoms.

The first minutes: what to actually do

Faced with a suspected ingestion or contact, there is one priority: get veterinary help moving as fast as possible, with the right information in hand. The sequence below is meant to be carried out while the antidote countdown has already begun.

Move the animal away from the source
Take the dog or cat away from the stain, the container or the puddle to stop any further intake. Do not let it lick its paws or coat if you suspect they touched the fluid.
Call the clinic or poison line at once
Phone immediately, even if the animal is fine and showing no signs. Say clearly that you suspect antifreeze or ethylene glycol: that single word changes how quickly help is mobilised.
Note the time and the amount
Record when the ingestion happened or might have happened and estimate the amount: a licked stain, a mouthful, half a container. These two facts guide the clinical decisions and the choice of antidote.
Do not induce vomiting on your own
Do not make the animal vomit and do not give anything by mouth without instruction. In some animals inducing vomiting can be dangerous, and the decision belongs to whoever is weighing species, timing and level of consciousness on the phone.
Take the container or a photo of the label
If you know the product, photograph the label or bring the container. Knowing the exact formulation helps to gauge the risk and start treatment without losing time.
Set off for the clinic while still on the phone
Every hour counts. Head for the practice you were directed to instead of waiting at home to see how things develop: with antifreeze, waiting is the worst choice.

What the vet can do

Treatment revolves entirely around time. The sooner you arrive, the more options stay open and the better the outlook. The vet has tools an owner simply cannot reproduce at home.

Antidote: there are drugs that block the enzyme which turns glycol into its toxic metabolites, and so prevent the kidney damage. They work only if given early, before the conversion has happened, which is what makes the time window so critical.
Intensive fluid therapy: it supports the circulation, promotes elimination and protects the kidney, and is an integral part of the plan.
Targeted tests: blood and urine analysis help to gauge exposure, follow kidney function over time and understand how much the kidney is suffering.
Haemodialysis: where kidney damage is already established, filtering the blood may be the only route, but it is available only at specialist centres and does not replace the timeliness of the antidote.

In ethylene glycol poisoning the outcome is almost always decided in the first hours: the antidote given early saves the kidney, the antidote given late no longer helps.
A shared principle in veterinary emergency medicine

No dose should be decided at home and no home remedy replaces the antidote. The owner's job is not to treat, it is to compress the time between ingestion and arrival at the clinic.

Prevention: shutting the door on a sweet poison

Preventing antifreeze poisoning is concrete and within anyone's reach, because almost every episode starts from fluids stored or spilled carelessly in places the animal can get to.

Store antifreeze, screen wash and car fluids in tightly closed containers, up high and out of reach of dogs and cats.
Clean up every leak or splash at once, and wipe stains under the car rather than leaving them to evaporate on their own.
Check the driveway and garage for coloured puddles, especially after car maintenance or during winter.
Do not leave open containers or dirty funnels on the ground while topping up, not even for a few minutes.
Be wary of decorative objects that hold liquids, such as some snow globes, keeping them away from animals that could break them.
Where possible, consider products based on propylene glycol, which is considered less toxic, while keeping every precaution in place.
Watch the animal in unfamiliar places such as other people's garages, workshops and car parks, where you do not know the state of the floor.

A health diary kept up to date with the current body weight and the number of the nearest open clinic does not prevent ingestion, but it saves precious minutes at the moment when every minute weighs on the outcome.

Frequently asked questions

My dog only licked a stain under the car: should I worry?: Yes, it should be handled as a potential emergency. Ethylene glycol is toxic in small amounts and the animal does not need to drink much to risk kidney damage, especially a cat. Do not wait for symptoms to appear: call the clinic or a poison line right away, say you suspect antifreeze, note the time and estimated amount, and get moving. The antidote is only effective in the first hours, so speed matters more than anything else.
The animal seemed drunk but is fine now: is the danger over?: No, and this is exactly the deception of ethylene glycol. The early phase with a wobbly gait can ease off and give the impression of recovery, but in the meantime the toxic metabolites are setting up the kidney damage, which shows up severely one to three days later. The apparent improvement is not a cure and is in fact the moment when the antidote risks becoming useless. An immediate clinical assessment is still needed.
Should I make my dog or cat vomit before going to the clinic?: Not on your own. In some cases inducing vomiting can be dangerous, for instance if the animal is confused or poorly responsive, with a risk of aspiration, and in any case it does not remove the glycol already absorbed. The decision on how and whether to empty the stomach belongs to whoever is weighing species, elapsed time and level of consciousness. Call, describe the situation and follow the instructions: the most useful thing you can do is arrive quickly.
How long do I have for the antidote?: The window is only a few hours, because the antidote works by blocking the conversion of glycol into its toxic metabolites: once that conversion has happened, the drug can no longer prevent the kidney damage. There is no single limit that fits every case, but the principle is that the sooner you arrive, the better. That is why antifreeze poisoning is treated as a race against the clock, acting on the suspicion of ingestion rather than waiting for symptoms.
Are there antifreeze products that are less dangerous to animals?: Some products use propylene glycol instead of ethylene glycol and it is considered less toxic, though not entirely harmless. Choosing them lowers the risk, but it does not remove the need to store, use and clean up these fluids with the greatest care. Even the safest product should be kept closed and away from animals, and every spill should be removed at once. Prevention remains the main line of defence.

What to do next

Antifreeze is sweet, toxic in small amounts and its antidote only works in the first hours: treat it as a call-immediately emergency. If you suspect ingestion or contact, move the animal away from the source, phone the clinic at once saying you suspect ethylene glycol, note the time and amount, do not induce vomiting on your own, and set off for the practice without waiting for symptoms, because by the time they appear it is often too late to save the kidney.