All animals need a constant supply of fresh drinking water.
Many domestic animals do not sweat to keep cool. Dogs, for instance, have no sweat glands and can only lose heat by panting. Make sure they have plenty of water to help them keep cool.
Check and fill their water bowls regularly.

Watch out for warning signs
If your dog pants quickly, looks very tired or collapses, it could be suffering from heatstroke. Put it in a cool, shady spot and spray its body with cool water, or give it a cool bath immediately. Contact a veterinary surgeon urgently for further advice as heatstroke can be fatal.