This is a pretty well-known thing, but important to repeat: never leave your dog alone in a hot car. Cars can quickly reach dangerous levels of heat, easily becoming 20 degrees warmer than temperatures outside. And leaving the windows open isn't enough to cool the car down to safe temperatures. If you have tasks at places that don't allow dogs, it's best to keep your pup at home or take him to daycare.
7. Be Knowledgeable
It's aways a good idea to be prepared, just in case, and knowing the signs of heatstroke can save lives. If you see your dog excessively panting without resolution, it can indicate heatstroke. Other signs include dark red or purple tongue, difficulty breathing, glazed eyes, rapid heartbeat and vomiting.
Pro Tip: Brachycephalic breeds (those with short muzzles), overweight dogs, dogs with thick or heavy fur, and older dogs are more prone to heatstroke.