Make sure they always have access to fresh clean water
Ensure there is a shaded space for them to lay around outside
Take them to the vet for a check-up – ensure they are healthy and checked for heartworm, etc
Animals with flatter faces who may have a hard time breathing (pugs, french bulldogs, Persian cats, etc) should always be kept out of the heat in order to ensure they can pant/breathe properly and cool down
Do not leave animals in a parked vehicle outside during high temperatures
Brush and pet your cats regularly or even trim longer coats, shaving them completely reduces their ability to cool down and prevent sunburn
Do not walk outside unless you have protective footwear for your pet
Be mindful of outdoor gatherings, human food can be dangerous for pets and lead to medical problems.
Be especially careful to avoid giving your pets raisins, grapes, onions, chocolate, and products with the sweetener xylitol (this includes some brands of peanut butter!).