Is antifreeze dangerous for dogs in winter?

Most traditional antifreeze products contain ethylene glycol, a chemical that is metabolized in the body into compounds that cause severe kidney damage, and even a relatively small amount can be enough to cause serious harm to a dog, particularly a small one. The sweet taste of many antifreeze products means dogs are not deterred the way they might be from a bitter or unpleasant-tasting hazard, which adds to the risk.

Winter brings more antifreeze use for topping up car radiators and washer fluid, and spills or drips onto driveways, garage floors, or parking areas are common during this seasonal top-up period, creating puddles a dog might encounter and lick during an otherwise ordinary walk or time in the garden. Checking under a parked car for any colored puddle before letting a dog into that area is a simple, useful winter habit.

A dog that has ingested antifreeze may initially seem oddly drunk or uncoordinated, followed by a period that can look like improvement before more serious kidney-related symptoms appear over the following day or two, which is part of why any suspected exposure needs immediate attention rather than waiting to see if symptoms develop.

Treat any known or suspected antifreeze exposure as an emergency and get to a vet immediately, even if the dog seems fine at that moment, since the window for effective treatment narrows quickly and the apparent early improvement can be misleading. Cleaning up any spills promptly and storing antifreeze securely, well out of reach, prevents the situation from arising in the first place.