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Heatstroke in pets, and what to do about a dog in a hot car
Heatstroke can kill pets quickly. Signs in dogs include heavy panting, drooling, lethargy or unsteadiness, vomiting and collapse. If you see a dog in distress in a hot car, the RSPCA advises calling 999. Never leave a pet in a parked car on a warm day.
General information for the UK, checked on 2026-09-23. It is not legal or veterinary advice. For your own situation, speak to a solicitor, your local council or a vet.
Signs of heatstroke
- Heavy panting and difficulty breathing
- Excessive drooling
- Lethargy, drowsiness or unsteadiness
- Vomiting or diarrhoea
- Collapse
What to do
- Move the animal to a cool, shaded place
- Pour cool (not ice-cold) water over them, and let them drink small amounts of cool water
- Contact a vet urgently, even if they seem to recover
A dog in a hot car
If a dog is showing any sign of heatstroke, dial 999: the RSPCA may not reach the scene quickly enough and has no power to enter the car. If the dog seems well, try to find the owner, note the registration, and have someone watch the dog. Breaking into a car without proper justification can be criminal damage, so tell the police what you intend to do, and take photos and witness details.
Preventing heatstroke
- Never leave a pet in a parked car, caravan or conservatory on a warm day
- Walk dogs early in the morning or late in the evening, and check that pavements are not too hot
- Give constant access to shade and fresh water, including for rabbits and guinea pigs in hutches
- Take extra care with flat-faced breeds, older and overweight pets
Frequently asked questions
What should I do if I see a dog in a hot car?
If the dog shows any sign of heatstroke, such as heavy panting, drooling, lethargy or collapse, call 999. If it seems well, try to find the owner and keep watch.
What are the signs of heatstroke in dogs?
Heavy panting, excessive drooling, lethargy or unsteadiness, vomiting and collapse. Heatstroke is an emergency, so contact a vet urgently.
How do I cool down an overheated dog?
Move it to a cool, shaded place, pour cool (not ice-cold) water over it, offer small drinks of water, and contact a vet straight away.
Can I break a car window to rescue a dog?
Without proper justification this can be criminal damage. Call 999 first, tell the police what you intend to do, and gather photos and witness details.
Sources
Related guides
- Foods and plants that are toxic to dogs and cats
- Dogs: care, health, law and costs
- Rabbits: care, health, law and costs
- Taking your dog or cat abroad from the UK
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Open Be Pet WiseBrowse all guidesReviewed 2026-09-23. General information for the UK, not veterinary or legal advice. See how we check.