No one wants to drink hot water. Old and overweight animals have a more difficult time in the heat, make considerations for them, and keep them inside if possible. Be watchful of pesticides. Your pet doesn't wear shoes on his feet or pants to keep these things off their bodies. Weed killers, and insecticides can make your pet sick or even kill them.
Engine coolant kills.
Animals are draws to its sweet smell, and they can die from it. If you spill some, be sure to clean the area promptly. It takes less than a tablespoon to kill a cat or small dog, and only slightly more to kill a larger dog. A well brushed pet will be cooler. Make sure never to shave an Arctic breed dog short.