It's a topic that arises every time we experience a hot weather spell - and something people still need to learn from.
For dog owners, when the weather is as nice as it currently is in the UK, heading out on walks is one of life's little pleasures.
But of course, just like the sun poses risks for humans, out four-legged friends also need to be well looked after.
And the big issue of leaving a dog locked in a hot car never seems to go away.
Animal charities such as the RSPCA and Kennel Club run a campaign entitled 'Dogs Die in Hot Cars' and sadly, it is true.
But if you do find yourself in a position where you see a dog being kept in a vehicle during the heatwave, there is something you can do about it.
The RSPCA say that if if you see a dog in distress in a hot car, dial 999.
An instinctive reaction may be to break into a car, but this isn't always the best option as it could become a criminal offence even if you are trying to help.
The animal charity advises that you should tell the police what you intend to do and why and it says to "take pictures or videos of the dog and the names and numbers of witnesses to the incident."
Under section 5 of the Criminal Damage Act 1971, you have a lawful excuse to commit damage if you believe that the owner of the property you intend to damage would consent if they knew the circumstances.
So it is important to act with caution.
Once the dog is removed from the vehicle, you need to check if they are suffering from heatstroke.
The key signs are heavy panting, excessive drooling, lethargy, drowsiness and uncoordination. The dog may have also collapsed or is vomiting.
In this case, the RSCPA again advise to phone 999 but you can also follow their first aid guide which is available on its website.
If the dog isn't displaying symptoms of heatstroke, you can call the RSPCA's 24-hour cruelty line for advice on 0300 1234 999.
Though it is not illegal, dog owners should also be aware that leaving your pet in a hot vehicle is a criminal offence.
Under the Animal Welfare Act 2006, if a dog suffers or dies as a result of being left in a hot car, their owner can be prosecuted for neglect or cruelty.
