Heatstroke is a life threatening emergency that can develop within minutes on a hot day. If your dog or cat is panting heavily, drooling, weak, vomiting, or collapsing after heat or exercise, move them to a cool place, offer small sips of water, begin gentle cooling, and get to an emergency veterinarian right away. Do not wait to see if it improves.
Why heatstroke is so dangerous
Dogs and cats do not sweat the way people do. They cool themselves mainly by panting, which is far less effective, so their body temperature can climb quickly on a warm day or during exercise. Once it rises too high, heatstroke sets in and can damage the organs within minutes.
This is a true emergency, not something to manage at home or wait out. Every minute counts, and early cooling on the way to care can make a real difference. Knowing the signs before a hot day arrives means you can act fast if your pet ever needs it.
Warning signs to watch for
Early signs of overheating include heavy or frantic panting, bright red gums, thick drool, restlessness, and a pet who cannot seem to settle or cool down. As heatstroke progresses, you may see weakness, stumbling, vomiting or diarrhea, confusion, collapse, or seizures.
Cats are less often affected but can overheat too, and they may show open mouth breathing, drooling, and lethargy. If your pet shows any of the more serious signs after being in the heat, treat it as an emergency and seek care straight away rather than watching and waiting.
What to do right away
Act quickly and calmly. Move your pet out of the heat into shade or a cool, air conditioned space. Offer small amounts of cool water to drink, but do not force it. Begin cooling by wetting the coat with cool, not ice cold, water, especially over the belly, groin, and paws, and use a fan or moving air to help.
Avoid ice or ice cold water, which can cool too fast and cause other problems. Do not cover your pet with a wet towel and leave it, as this can trap heat. Once cooling has started, head to an emergency veterinarian right away, even if your pet seems to be improving, because internal effects are not always visible.
Which pets are most at risk
Some pets are far more vulnerable to heat. Flat faced breeds such as pugs, bulldogs, and Persian cats struggle to move air and overheat easily. Older pets, very young ones, overweight pets, those with heart or breathing conditions, and pets with thick coats are also at higher risk.
Even a healthy, active dog can overheat if exercised hard on a warm day. Knowing whether your pet is in a higher risk group helps you take extra care during hot weather and recognize trouble early.
Preventing heatstroke this summer
Most heatstroke is preventable. Never leave a pet in a parked car, even for a few minutes and even with the windows cracked, because temperatures inside rise dangerously fast. Walk dogs in the cooler early morning or evening, and avoid strenuous exercise during the heat of the day.
Always provide shade and fresh water, and check that hot pavement is not burning your dog’s paws before a walk. On very hot days, it is safer to keep activity light and let your pet rest somewhere cool. These simple steps prevent the great majority of heat emergencies.
How an emergency clinic treats heatstroke
At the clinic, the team works quickly to lower your pet’s temperature safely and support the body while it recovers. Care often includes controlled cooling, intravenous fluids, oxygen, and close monitoring, with pet diagnostics used to check how the organs have been affected.
Because heatstroke can cause internal damage that appears hours later, pets are often monitored through our medical services even after they look better. Getting your pet to emergency surgical services and critical care quickly gives the best chance of a full recovery.
Frequently asked questions
My dog cooled down at home. Do I still need the vet?
Yes. Heatstroke can cause internal damage that shows up hours later, even after your pet seems better. A pet who has overheated should be assessed promptly rather than just watched at home.
Should I use ice water to cool my pet?
No. Use cool, not ice cold, water. Ice or ice cold water can cool too quickly and cause other problems. Wet the coat with cool water and use moving air while you head to the clinic.
How hot does it have to be for heatstroke?
It does not take extreme heat. Warm, humid days, a hot car, or hard exercise can be enough, especially for at risk pets. Flat faced, older, and overweight pets can overheat surprisingly easily.
Is it safe to leave my dog in the car with the windows down?
No. A parked car heats up dangerously fast even with the windows cracked, and it is never safe, even for a few minutes. Leave your dog at home on hot days instead.
What are the very first signs of overheating?
Heavy, frantic panting, bright red gums, thick drool, and restlessness are early clues. If you see these after heat or exercise, cool your pet and seek care before signs get worse.