A large number of dogs may end up needing pet meds because their owners still leave them locked in cars on sunny days.
Dogs Trust found that 60 per cent of people have seen a dog locked in a car on a hot day, despite warnings that this is a very dangerous thing to do.
Temperatures in parked cars can reach over 40 degrees and dogs can die within minutes in these conditions.
As a result, Dogs Trust has teamed with the AA and the National Trust to launch a new campaign, Hot Cars Can Kill Dogs.
Of the 60 per cent of people who had seen dogs locked into cars, 15 per cent called the police, 49 per cent tried to alert the driver and four per cent even broke into the car to rescue the animal.
Paula Boyden, veterinary director of Dogs Trust, said: "It is shocking to see that so many people consider leaving their dog in the car, whatever the weather.
"You wouldn't leave your child in the car. Given how quickly the temperature can rise, it is equally unfathomable that you would leave your pet."
She added that if you see a dog locked in a car, report it, as this can help to prevent any further dog deaths.