Dog owners are being urged to keep pets indoors.
The warning comes as a ‘dog lockdown’ during extreme heat is recommended by the RSPCA amid rising temperatures in England and Wales.
Temperatures are expected to reach as high as 39°C across the UK during the peak of the heatwave.
Lauren Bennet, dog welfare expert at the RSPCA and a former veterinary nurse, said: "During a red weather warning, dog owners should think of it like a temporary lockdown for their pets.
"For the next 24 to 48 hours, routines need to immediately change.
"This isn’t the time for walks, chasing the ball or playing fetch, or exposing pooches to energetic exercise.
"It’s far better for dogs to miss a few walks completely than to suffer the potentially fatal consequences of overheating or heatstroke."
The RSPCA has issued the warning as a red weather alert for heat remains in place across England and Wales.
Ms Bennet said: "One of the biggest risks during periods of extreme heat is treating them like any other summer day.
"We’re urging dog owners to make this a Summer of Kindness – and focus on keeping dogs cool, comfortable and calm at home until temperatures start to ease.
"Fresh water, air flow, shade and mental enrichment can make all the difference during this intense period of extreme heat."
The charity advised owners to skip walks entirely, but if necessary, limit outings to brief trips for toilet breaks only.
They also recommended indoor activities like puzzle feeders and training games as alternatives to outdoor exercise during the heat.
Keeping the home cool is also critical.
The RSPCA suggested closing curtains in sunny rooms, using fans safely, and providing access to cooler floors.
Dog cooling mats and damp towels can also help pets stay comfortable.
Water should be refreshed regularly and offered in multiple locations.
One or two ice cubes can also be added, if suitable for the dog.
Good air flow is important, and open windows can help create a breeze if it is safe to do so.
Fans should be used where appropriate, and hot, enclosed spaces like conservatories should be kept off-limits to pets.
Ms Bennet said: "These temperatures won't last forever, but the decisions owners make over the next couple of days could have a lasting impact on their pets.
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"For now, the message is simple.
"Pause normal routines, prioritise keeping pets cool and comfortable, and wait until temperatures ease before returning to business as usual."
The RSPCA stresses that for many dogs, missing walks for a day or two is safer than risking heat-related illness or injury.
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