What are signs of heatstroke in dogs?

Heavy panting, drooling, collapse, vomiting, bright red gums, or uncoordinated movement. Heatstroke is an emergency — cool with tepid (not ice-cold) water and contact a vet immediately.

Can I leave my dog in a car on a warm day?

Never. UK car interiors reach lethal temperatures within minutes even with windows cracked. Call 999 if you see a dog in distress in a hot car.

Are rabbits at risk in summer?

Yes. Rabbits overheat above roughly 25°C and are at high risk of flystrike if rear fur becomes soiled and damp. Move hutches to shade, provide frozen water bottles, and check twice daily.

What temperature is too hot for dogs in the UK?

Many vets advise avoiding walks in the hottest part of the day when temperatures exceed roughly 20°C for sensitive breeds, or when pavement is too hot to hold your hand on for five seconds. Use the PETHEALTH+ walk-temperature checker as a sense-check.

Can cats get heatstroke?

Yes, especially in overheated conservatories, cars, or flats without ventilation. Open-mouth breathing, drooling, and collapse need emergency vet care.

Is blue-green algae dangerous to dogs?

Yes. Toxic blooms in lakes and ponds can kill dogs within hours. Do not let dogs swim or drink from affected water — rinse and call a vet if exposure occurs.

Pet Care

Hot Weather Pet Safety in the UK

Published 1 June 2026Last updated 13 August 20265 min read

Quick answer

In UK heatwaves, walk dogs at dawn or dusk, never leave pets in cars, and keep rabbits and guinea pigs in shade. Heatstroke is an emergency for every species. Check is it too hot to walk your dog? before a midday outing. Keep dogs out of water with blue-green algae — it can be fatal.

Key takeaways

Never leave pets in cars. Walk dogs at dawn or dusk; skip hot tarmac. Heatstroke is an emergency for every species.
Rabbits and guinea pigs overheat in sunlit hutches; check for flystrike twice daily in warm weather.
Blue-green algae can kill dogs within hours — no swimming or drinking from pea-soup water.

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UK heatwave priorities

According to the BVA and RSPCA, the highest-risk summer mistakes for UK pets are hot cars, exercise in midday heat, and hutches or vivariums overheating.

Rule	Why it matters
Never leave pets in cars	Interior temperatures can exceed 40°C within minutes
Walk dogs when cool	Exercise is a leading cause of canine heatstroke
Shade + water for hutched pets	Rabbits and guinea pigs cannot sweat effectively
Check vivarium temperatures	Room heat plus lamps can overheat reptiles
Avoid algae ponds	Blue-green algae toxins kill dogs every summer

This hub points to species pages. For canine first aid in detail use dog heatstroke. For walk timing use can I walk my dog in hot weather? and the walk temperature checker.

Dogs in hot weather

Exercise at dawn or dusk
Pavement test: back of the hand on tarmac for five seconds; if it hurts, it burns pads
Fresh water always; ice cubes are a treat for many healthy dogs — never ice to treat heatstroke — can dogs eat ice cubes?
Flat-faced breeds overheat faster
Paddling pools in shade — tepid water, not ice shock

Cats in hot weather

Ventilation; overheated conservatories and cars kill cats as well as dogs
Several water bowls; some prefer running water
Pale gums, open-mouth breathing or collapse — emergency
See cat hot weather safety

Rabbits and guinea pigs

Move hutches to permanent shade — sun tracks around the garden
Frozen water bottles wrapped in fleece to lean on
Check for flystrike twice daily — soiled damp fur attracts flies in warm weather
Guinea pigs overheat quickly — bring indoors when it is hot
Guides: rabbit summer care · rabbit flystrike · guinea pig heatstroke

Birds, reptiles, horses and chickens

Pet	Key summer risk	Guide
Birds	Cage in direct sun	Bird hot weather safety
Reptiles	Vivarium overheating	Reptile overheating UK
Horses	Dehydration, colic	Horse hot weather UK
Chickens	Heat stress in coops	Chicken heat stress UK

Blue-green algae

According to the BVA, toxic blooms appear in lakes, ponds and slow rivers in warm weather — often like pea soup or paint on the surface.

Do not let dogs swim or drink
Rinse the coat if there was contact and phone your vet immediately
Full guide: blue-green algae poisoning

Heatstroke first aid (all pets)

Move to shade or a cool room
Offer small amounts of cool (not ice-cold) water if conscious
Tepid water on fur or skin — wet towels for dogs and cats
Phone your vet while cooling
Transport with windows open or air-con on

Collapse, seizures, uncontrolled vomiting, or breathing that does not settle: emergency vet and out-of-hours directory.

Cars, conservatories and “just two minutes”

UK car interiors climb fast enough to kill on a mild spring day, not only in a named heatwave. Windows on a crack do not make it safe. The same physics applies to conservatories, parked vans and caravans. If you see a dog or cat in distress in a vehicle, call 999.

Paddling pools help some dogs if the water is tepid and there is shade. Ice baths and ice-cold hoses are for heatstroke treatment myths — see dog heatstroke. Ice cubes as a treat for a healthy dog are a different question: can dogs eat ice cubes?.

Check the walk temperature checker before a midday circuit. If the tool says skip or shorten, believe it more than “they need the exercise”. Sniffing games indoors count. Flat-faced dogs, elderly pets and hutched rabbits need the conservative end of every table on this page. If a heatwave warning is in force, skip the walk and use the species pages rather than “they’ll be fine for ten minutes”.

Sources & further reading

Facts in this guide are rewritten in plain English from publicly available UK advice. We name the organisation where a specific point comes from their guidance. Links below go to the original pages — use them to read the source material directly.

PETHEALTH+ is independent. These organisations do not sponsor, approve, or partner with this website. Guidance checked against sources listed below (last updated 2026-08-13).

Frequently Asked Questions

What are signs of heatstroke in dogs?: Heavy panting, drooling, collapse, vomiting, bright red gums, or uncoordinated movement. Heatstroke is an emergency — cool with tepid (not ice-cold) water and contact a vet immediately.
Can I leave my dog in a car on a warm day?: Never. UK car interiors reach lethal temperatures within minutes even with windows cracked. Call 999 if you see a dog in distress in a hot car.
Are rabbits at risk in summer?: Yes. Rabbits overheat above roughly 25°C and are at high risk of flystrike if rear fur becomes soiled and damp. Move hutches to shade, provide frozen water bottles, and check twice daily.
What temperature is too hot for dogs in the UK?: Many vets advise avoiding walks in the hottest part of the day when temperatures exceed roughly 20°C for sensitive breeds, or when pavement is too hot to hold your hand on for five seconds. Use the PETHEALTH+ walk-temperature checker as a sense-check.
Can cats get heatstroke?: Yes, especially in overheated conservatories, cars, or flats without ventilation. Open-mouth breathing, drooling, and collapse need emergency vet care.
Is blue-green algae dangerous to dogs?: Yes. Toxic blooms in lakes and ponds can kill dogs within hours. Do not let dogs swim or drink from affected water — rinse and call a vet if exposure occurs.