For dog owners, their pet pooch can become an important part of the family and often go along for a ride in the car.
But it is far from safe. The temperature inside a car can rise by as much as 20 degrees fahrenheit in ten minutes, and 40 degrees fahrenheit after an hour.
Being left inside a car can put the dog at risk of heat stroke, which can kill them in as little as 15 minutes.
And without ventilation or water, this can be an even more dangerous environment for a dog.
Here, people are asked how long a dog should be kept in a car. Answers range from two minutes to an hour.
The RSPCA says: "Never leave your dog alone in a car on a warm day.
"Many people still believe that it's ok to leave a dog in a car on a warm day if the windows are left open or they're parked in the shade, but the truth is, it's still a very dangerous situation for the dog.
"A car can become as hot as an oven very quickly, even when it doesn't feel that warm."
But what do you do if you see a dog in a car on a warm day?
The RSPCA says: "In an emergency, we may not be able to attend quickly enough, and with no powers of entry, we'd need police assistance at such an incident.
"Don't be afraid to dial 999, the police will inform us if animal welfare assistance is required."
Further RSPCA guidelines and advice can be found here.